Spread of Islam
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The Spread of Islam began when prophet Muhammad (570 - 632) started preaching the revelation he claimed to have received from God at the age of 40. During his lifetime the Muslim ummah was established in Arabia by way of their conversion or allegiance to Islam. In the first centuries conversion to Islam followed the rapid growth of the Muslim world created by the conquests of the Rashidun and Umayyad Caliphs.
Muslim dynasties were soon established and subsequent empires such as those of the Abbasids, Fatimids, Almoravids, Seljukids, Ajuuraan, Adal and Warsangali in Somalia, Mughals in India and Safavids in Persia and Ottomans were among the largest and most powerful in the world. The people of the Islamic world created numerous sophisticated centers of culture and science with far-reaching mercantile networks, travelers, scientists, hunters, mathematicians, doctors and philosophers, all of whom contributed to the Golden Age of Islam.
The activities of this quasi-political community of believers and nations, or ummah, resulted in the spread of Islam over the centuries, spreading outwards from Mecca to the Atlantic Ocean in the west and the Pacific Ocean on the east. As of October 2009, there were 1.571 billion Muslims, making Islam the second-largest religion in the world.
The conquests of the Arab Empire in the first centuries after the Islamic prophet Muhammad's death soon established Muslim dynasties in North Africa, West Africa, throughout the Middle East, Somalia and in Iran.
Phase I: The Early Caliphs and Umayyads (610-750 AD) 
Within the first century of the establishment of Islam upon the Arabian peninsula and the subsequent rapid expansion of the Arab Empire during the Muslim conquests, resulted in the formation of one of the most significant empires in history. For the subjects of this new empire, formerly subjects of the greatly reduced Byzantine, and obliterated Sassanid Empires, not much changed in practice. The objective of the conquests was more than anything of a practical nature, as fertile land and water were scarce in the Arabian peninsula. A real Islamization therefore only came about in the subsequent centuries.
Ira Lapidus distinguishes between two separate strands of converts of the time: one is animists and polytheists of tribal societies of the Arabian peninsula and the Fertile crescent; the other one is the monotheistic populations of the Middle Eastern agrarian and urbanized societies.
Islam was introduced in Somalia in the 7th century when the Muslim Arabs fled from the persuction of the Pagan Quraysh tribe. When the Muslims defeated the Pagans, some returned to Arabia, but many decided to stay there and established Muslim communities along the Somali coastline. The local Somalis adopted the Islamic faith well before the faith even took root in its place of origin.
For the polytheistic and pagan societies, apart from the religious and spiritual reasons each individual may have had, conversion to Islam "represented the response of a tribal, pastoral population to the need for a larger framework for political and economic integration, a more stable state, and a more imaginative and encompassing moral vision to cope with the problems of a tumultuous society." In contrast, for sedentary and often already monotheistic societies, "Islam was substituted for a Byzantine or Sassanian political identity and for a Christian, Jewish or Zoroastrian religious affiliation." Conversion initially was neither required nor necessarily wished for: "(The Arab conquerors) did not require the conversion as much as the subordination of non-Muslim peoples. At the outset, they were hostile to conversions because new Muslims diluted the economic and status advantages of the Arabs."
Only in subsequent centuries, with the development of the religious doctrine of Islam and with that the understanding of the Muslim ummah, did mass conversion take place. The new understanding by the religious and political leadership in many cases led to a weakening or breakdown of the social and religious structures of parallel religious communities such as Christians and Jews.
The caliphs of the Umayyad dynasty established the first schools inside the empire, called madrasas, which taught the Arabic language and Islamic studies. They furthermore began the ambitious project of building mosques across the empire, many of which remain today as the most magnificent mosques in the Islamic world, such as the Umayyad Mosque in Damascus. At the end of the Umayyad period, less than 10% of the people in Iran, Iraq, Syria, Egypt, Tunisia and Spain were Muslim. Only on the Arabian peninsula was the proportion of Muslims among the population higher than this.
Phase II: The Abbasids (750-1258) 
This was the time of the Abbasid Dynasty (750-1258), the second great dynasty with the rulers carrying the title of 'Caliph'.
Expansion ceased and the central disciplines of Islamic philosophy, theology, law and mysticism became more widespread and the gradual conversions of the populations within the empire occurred. Significant conversions also occurred beyond the extents of the empire such as that of the Turkic tribes in Central Asia and peoples living in regions south of the Sahara in Africa through contact with Muslim traders active in the area and sufi missionaries. In Africa it spread along three routes, across the Sahara via trading towns such as Timbuktu, up the Nile Valley through the Sudan up to Uganda and across the Red Sea and down East Africa through settlements such as Mombasa and Zanzibar. These initial conversions were of a flexible nature and only later were the societies forcibly purged of their traditional influences.
The reasons why, by the end of the 10th century, a large part of the population had converted to Islam are diverse. One of the reasons may be that
"Islam had become more clearly defined, and the line between Muslims and non-Muslims more sharply drawn. Muslims now lived within an elaborated system of ritual, doctrine and law clearly different from those of non-Muslims. (...) The status of Christians, Jews and Zoroastrians was more precisely defined, and in some ways it was inferior. They were regarded as the 'People of the Book', those who possessed a revealed scripture, or 'People of the Covenant', with whom compacts of protection had been made. In general they were not forced to convert, but they suffered from restrictions. They paid a special tax; they were not supposed to wear certain colors; they could not marry Muslim women;."
It should be pointed out that most of these laws were elaborations of basic laws concerning non-Muslims (dhimmis) in the Quran. The Quran does not give much detail about the right conduct with non-Muslims, in principle recognizing the religion of "People of the book" (Jews, Christians, and sometimes others as well) and securing a separate tax from them inlieu of the zakat imposed upon Muslim subjects.
"The question of why people convert to Islam has always generated intense feeling. Earlier generations of European scholars believed that conversions to Islam were made at the point of the sword, and that conquered peoples were given the choice of conversion or death. It is now apparent that conversion by force, while not unknown in Muslim countries, was, in fact, rare. Muslim conquerors ordinarily wished to dominate rather than convert, and most conversions to Islam were voluntary. (...) In most cases worldly and spiritual motives for conversion blended together. Moreover, conversion to Islam did not necessarily imply a complete turning from an old to a totally new life. While it entailed the acceptance of new religious beliefs and membership in a new religious community, most converts retained a deep attachment to the cultures and communities from which they came."
The result of this, he points out, can be seen in the diversity of Muslim societies today, with varying manifestations and practices of Islam.
Conversion to Islam also came about as a result of the breakdown of historically religiously organized societies: with the weakening of many churches, for example, and the favoring of Islam and the migration of substantial Muslim Turkish populations into the areas of Anatolia and the Balkans, the "social and cultural relevance of Islam" were enhanced and a large number of peoples were converted. This worked better in some areas (Anatolia) and less in others (e.g. the Balkans, where "the spread of Islam was limited by the vitality of the Christian churches.")
Along with the religion of Islam, the Arabic language and Arab customs spread throughout the empire. A sense of unity grew among many though not all provinces, gradually forming the consciousness of a broadly Arab-Islamic population: something which was recognizably an Islamic world had emerged by the end of the 10th century. Throughout this period, as well as in the following centuries, divisions occurred between Persians and Arabs, and Sunnis and Shiites, and unrest in provinces empowered local rulers at times.
Conversion within the Empire: Umayyad Period vs. Abbasid Period
There are a number of historians who see the rule of the Umayyads as responsible for setting up the "dhimmah" to increase taxes from the dhimmis to benefit the Arab Muslim community financially and to discourage conversion. Islam was initially associated with the ethnic identity of the Arabs and required formal association with an Arab tribe and the adoption of the client status of mawali. Governors lodged complaints with the caliph when he enacted laws that made conversion easier, depriving the provinces of revenues.
During the following Abbasid period an enfranchisement was experienced by the mawali and a shift was made in the political conception from that of a primarily Arab empire to one of a Muslim empire and c. 930 a law was enacted that required all bureaucrats of the empire to be Muslims. Both periods were also marked by significant migrations of Arab tribes outwards from the Arabian Peninsula into the new territories.
Conversion within the Empire: Conversion Curve
Richard Bulliet's "conversion curve" shows a relatively low rate of conversion of non-Arab subjects during the Arab centric Umayyad period of 10%, in contrast with estimates for the more politically multicultural Abbasid period which saw the Muslim population grow from approx. 40% in the mid-9th century to close to 100% by the end of the 11th century. This theory does not explain the continuing existence of large minorities of Christians in the Abbasid Period. Other estimates suggest that Muslims were not a majority in Egypt until the mid-10th century and in the Fertile Crescent until 1100. Syria may have had a Christian majority within its modern borders until the Mongol Invasions of the 13th century.
Phase III: Dissolution of the Abbasids and the emergence of the Seljuks and Ottomans (950-1450) 
The expansion of Islam continued in the wake of Turkic conquests of Asia Minor, the Balkans, and the Indian subcontinent. The earlier period also saw the acceleration in the rate of conversions in the Muslim heartland while in the wake of the conquests the newly conquered regions retained significant non-Muslim populations in contrast to the regions where the boundaries of the Muslim world contracted, such as Sicily and Al Andalus, where Muslim populations were expelled or forced to Christianize in short order. The latter period of this phase was marked by the Mongol invasion (particularly the siege of Baghdad in 1258) and after an initial period of persecution, the conversion of these conquerors to Islam.
Phase IV: Ottoman Empire: 13th Century - 1918 
The Ottoman Empire defended its frontiers initially against threats from several sides: the Safavids on the Eastern side, the Byzantine Empire in the North which vanished with the fall of Constantinople 1453, and the great Catholic powers from the Mediterranean Sea: Spain, the Holy Roman Empire, and Venice with its eastern Mediterranean colonies.
Later, the Ottoman Empire set on to conquer territories from these rivals: Cyprus and other Greek islands (except Crete) were lost by Venice to the Ottomans, and the latter conquered territory up to the Danube basin as far as Hungary. Crete was conquered during the 17th century, but the Ottomans lost Hungary to the Holy Roman Empire, and other parts of Eastern Europe, ending with the Treaty of Carlowitz (1699).
Phase V: (Post-Ottomans - present) 
By region 
Soon after the death of prophet Muhammad, all these provinces fell, one after the other, into the hands of the Muslims, who threatened, for a while, the entire extinction of Christianity in Western Asia. Due however to the tolerant attitude of the majority of the Umayyad, and the Abbasid caliphs of Damascus and Baghdad respectively, Christianity in the Muslim empire gradually began to experience a new and unprecedented level of revival and vigour. Nestorian and Jacobite theologians, philosophers, and men of letters soon became the teachers of the conquering Arabs, and the pioneers of Islamo-Arabic science, civilization, and learning. Nestorian physicians became the attending physicians of the court, and the Nestorian patriarch and his numerous bishops were regarded in Asia as second to none in power and authority.
Under the Umayyad and Abbasid Caliphs, Christianity enjoyed, with few exceptions, great freedom and respect throughout all the Muslim Empire, as can be seen from the facts and data collected by Assemani and Bar-Hebraeus, according to which many Nestorian and Jacobite patriarchs from the 7th to the 11th centuries received diplomas, or firmans, of some sort from prophet Muhammad himself, from Umar, Ali, Marwan, Al-Mansur, Harun al-Rashid, Abu Ja'far, and others. (Shedd, op. cit., 239-241; Assemani, De Catholicis Nestorianis, 41-433 sqq; Bar-Hebraeus, Chronicon Ecclesiasticum I, 309, 317, 319, 325; II, 465, 625; III, 307, 317, 229, 433, etc.; and Thomas of Marga, op. cit., II, 123, note:)
Greater Syria 
Like their Byzantine and late Sasanian predecessors, the Marwanid caliphs nominally ruled the various religious communities but allowed the communities' own appointed or elected officials to administer most internal affairs. Yet the Marwanids also depended heavily on the help of non-Arab administrative personnel and on administrative practices (e.g., a set of government bureaus). As the conquests slowed and the isolation of the fighters (muqatilah) became less necessary, it became more and more difficult to keep Arabs garrisoned. As the tribal links that had so dominated Umayyad politics began to break down, the meaningfulness of tying non-Arab converts to Arab tribes as clients was diluted; moreover, the number of non-Muslims who wished to join the ummah was already becoming too large for this process to work effectively.
The Muslim Saracen army attacked Jerusalem, held by the Byzantine Romans, in November, 636 CE. For four months, the siege continued. Ultimately, the Orthodox Patriarch of Jerusalem, Sophronius, an ethnic Arab, agreed to surrender Jerusalem to caliph Omar in person. The caliph, then at Medina, agreed to these terms and travelled to Jerusalem to sign the capitulation in the spring of 637. Sophronius also negotiated a pact with Omar, known as the Umariyya Covenant or Covenant of Omar, allowing for religious freedom for Christians in exchange for "jizya", a tax to be paid by conquered non-Muslims, called "dhimmis". Under Muslim Rule, the Christian and Jewish population of Jerusalem in this period enjoyed the usual tolerance given to non-Muslim theists.  
Having accepted the surrender, Omar then entered Jerusalem with Sophronius "and courteously discoursed with the patriarch concerning its religious antiquities". When the hour for his prayer came, Omar was in the Anastasis church, but refused to pray there, lest in the future Muslims should use that as an excuse to break the treaty and confiscate the church. The Mosque of Omar, opposite the doors of the Anastasis, with the tall minaret, is known as the place to which he retired for his prayer.
Bishop Arculf, whose account of his pilgrimage to the Holy Land in the 7th century, De Locis Sanctis, written down by the monk Adamnan, described reasonably pleasant living conditions of Christians in Palestine in the first period of Muslim rule. The caliphs of Damascus (661-750) were tolerant princes who were on generally good terms with their Christian subjects. Many Christians (e.g. St. John Damascene) held important offices at their court. The Abbasid caliphs at Baghdad (753-1242), as long as they ruled Syria, were also tolerant to Christians. Harun Abu-Ja-'afar (786-809), sent the keys of the Holy Sepulchre to Charlemagne, who built a hospice for Latin pilgrims near the shrine.
Rival dynasties and revolutions led to the eventual disunion of the Muslim world. In the 9th century, Palestine was conquered by the Fatimid dynasty of North Africa. Palestine once again became a battleground as the various enemies of the Fatimids attacked. At the same time, the Byzantine Greeks continued to attempt to regain their lost territories, including Jerusalem. Christians in Jerusalem who sided with the Byzantines were put to death for high treason by the ruling Muslims. In 969, the Patriarch of Jerusalem, John VII, was put to death for treasonous correspondence with the Byzantines. As Jerusalem grew in importance to Muslims and pilgrimages increased, tolerance for other religions declined. Christians were persecuted and churches destroyed. The sixth Fatimid caliph, Caliph Al-Hakim, 996-1021, who was believed to be "God made manifest" by the Druze, destroyed the Holy Sepulchre in 1009. This powerful provocation helped ignite the flame of fury that led to the First Crusade.
Persia and Central Asia 
It used to be argued that Zoroastrianism quickly collapsed in the wake of the Islamic conquest of Persia due to its intimate ties to the Sassanid state structure. Now however, more complex processes are considered, in light of the more protracted time frame attributed to the progression of the ancient Persian religion to a minority; a progression that is more contiguous with the trends of the late antiquity period. These trends are the conversions from the state religion that had already plagued the Zoroastrian authorities that continued after the Arab conquest, coupled with the migration of Arab tribes into the region during an extended period of time that stretched well into the Abbassid reign.
While there were cases such as the Sassanid army division at Hamra, that converted en masse before pivotal battles such as the Battle of al-Qādisiyyah, conversion was fastest in the urban areas where Arab forces were garrisoned slowly leading to Zoroastrianism becoming associated with rural areas. Still at the end of the Umayyad period, the Muslim community was only a minority in the region.
Islam was readily accepted by Zoroastrians who were employed in industrial and artisan positions because, according to Zoroastrian dogma, such occupations that involved defiling fire made them impure. Moreover, Muslim missionaries did not encounter difficulty in explaining Islamic tenets to Zoroastrians, as there were many similarities between the faiths. According to Thomas Walker Arnold, for the Persian, he would meet Ahura Mazda and Ahriman under the names of Allah and Iblis. At times, Muslim leaders in their effort to win converts encouraged attendance at Muslim prayer with promises of money and allowed the Quran to be recited in Persian instead of Arabic so that it would be intelligible to all.
A number of the inhabitants of Afghanistan accepted Islam through Umayyad missionary efforts, particularly under the reign of Hisham ibn Abd al-Malik and Umar ibn AbdulAziz. Later, the Samanids, whose roots stemmed from Zoroastrian theocratic nobility, propagated Sunni Islam and Islamo-Persian culture deep into the heart of Central Asia. The population within its areas began firmly accepting Islam in significant numbers, notably in Taraz, now in modern day Kazakhstan. The first complete translation of the Qur'an into Persian occurred during the reign of Samanids in the 9th century. According to historians, through the zealous missionary work of Samanid rulers, as many as 30,000 tents of Turks came to profess Islam and later under the Ghaznavids higher than 55,000 under the Hanafi school of thought. After the Saffarids and Samanids, the Ghaznavids re-conquered the Afghan-Persian region and invaded the Indian subcontinent in the 11th century. This was followed by the Ghurids and Timurids who further expanded the culture of Islam.
South Asia 
Contrary to popular belief, Islam came to South Asia prior to Muslim invasions of India. Islamic influence first came to be felt in the Indian subcontinent during the early 7th century with the advent of Arab traders. Arab traders used to visit the Malabar region, which was a link between them and the ports of South East Asia to trade even before Islam had been established in Arabia. According to Historians Elliot and Dowson in their book The History of India as told by its own Historians, the first ship bearing Muslim travelers was seen on the Indian coast as early as 630 AD. The first Indian mosque is thought to have been built in 629 AD, purportedly at the behest of an unknown Chera dynasty ruler, during the lifetime of Muhammad (c. 571–632) in Kodungallur, in district of Thrissur, Kerala by Malik Bin Deenar. In Malabar, Muslims are called Mappila.
H.G. Rawlinson, in his book: Ancient and Medieval History of India claims the first Arab Muslims settled on the Indian coast in the last part of the 7th century. This fact is corroborated, by J. Sturrock in his South Kanara and Madras Districts Manuals, and also by Haridas Bhattacharya in Cultural Heritage of India Vol. IV.
The Arab merchants and traders became the carriers of the new religion and they propagated it wherever they went. It was however the subsequent expansion of the Muslim conquest in the Indian subcontinent over the next millennia that established Islam in the region.
Embedded within these lies the concept of Islam as a foreign imposition and Hinduism being a natural condition of the natives who resisted, resulting the failure of the project to Islamicize the Indian subcontinent and is highly embroiled with the politics of the partition and communalism in India. These are typically represented by the following schools of thought:
- That the bulk of Muslims are descendants of migrants from the Iranian plateau or Arabs.
- A related view is that conversions occurred for non-religious reasons of pragmatism and patronage such as social mobility among the Muslim ruling elite or for relief from taxes
- Was a combination, initially made under duress followed by a genuine change of heart
- As a socio-cultural process of diffusion and integration over an extended period of time into the sphere of the dominant Muslim civilization and global polity at large.
Muslim missionaries played a key role in the spread of Islam in India with some missionaries even assuming roles as merchants or traders. For example, in the 9th century, the Ismailis sent missionaries across Asia in all directions under various guises, often as traders, sufis and merchants. Ismailis were instructed to speak potential converts in their own language. Some Ismaili missionaries traveled to India and employed effort to make their religion acceptable to the Hindus. For instance, they represented Ali as the tenth avatar of Vishnu and wrote hymns as well as a mahdi purana in their effort to win converts. At other times, converts were won in conjunction with the propagation efforts of rulers. According to Ibn Batuta, the Khiljis encouraged conversion to Islam by making it a custom to have the convert presented to the Sultan who would place a robe on the convert and award him with bracelets of gold. During Ikhtiyar Uddin Bakhtiyar Khilji's control of the Bengal, Muslim missionaries in India achieved their greatest success, in terms of number of converts to Islam. Although we must take into consideration the fact that these are historians opinions, Gandhi a Hindu from India, has also stated:
"I become more than ever convinced that it was not the sword that won a place for Islam in those days. It was the rigid simplicity, the utter self-effacement of the Prophet, the scrupulous regard for pledges, his intense devotion to his friends and followers and his intrepidity, his fearlessness, his absolute trust in God and in his own mission. These and not the sword carried everything before them and surmounted every obstacle”
Southeast Asia 
Even before Islam was established amongst Indonesian communities, Muslim sailors and traders had been often visited the shores of modern Indonesia, most of these early sailors and merchants arrived from the Abbasid Caliphate's newly established ports of Basra and Debal, many of the earliest Muslim accounts of the region note the presence of animals such as Orang-utans, Rhinos and valuable Spice trade commodities such as Cloves, Nutmeg, Galangal and Coconut.
Islam came to the Southeast Asia, first by the way of Muslim traders along the main trade-route between Asia and the Far East, then was further spread by Sufi missionaries and finally consolidated by the expansion of the territories of converted rulers and their communities. The first communities arose in Northern Sumatra (Aceh) and the Malacca's remained a stronghold of Islam from where it was propagated along the trade routes in the region. There is no clear indication of when Islam first came to the region, the first Muslim gravestone markings date to 1082.
When Marco Polo visited the area in 1292 he noted that the urban port state of Perlak was Muslim, Chinese sources record the presence of a Muslim delegation to the emperor from the Kingdom of Samudra (Pasai) in 1282, other accounts provide instances of Muslim communities present in the Melayu Kingdom for the same time period while others record the presence of Muslim Chinese traders from provinces such as Fujian. The spread of Islam generally followed the trade routes east through the primarily Buddhist region and a half century later in the Malacca's we see the first dynasty arise in the form of the Sultanate of Malacca at the far end of the Archipelago form by the conversion of one Parameswara Dewa Shah into a Muslim and the adoption of the name Muhammad Iskandar Shah after his marriage to a daughter of the ruler of Pasai.
In 1380 Sufi missionaries carried Islam from here on to Mindanao. Java was the seat of the primary kingdom of the region, the Majapahit Empire, which was ruled by a Hindu dynasty. As commerce grew in the region with the rest of the Muslim world, Islamic influence extended to the court even as the empires political power waned and so by the time Raja Kertawijaya converted in 1475 at the hands of Sufi Sheikh Rahmat, the Sultanate was already of a Muslim character.
Another driving force for the change of the ruling class in the region was the concept among the increasing Muslim communities of the region when ruling dynasties to attempt to forge such ties of kinship by marriage. By the time the colonial powers and their missionaries arrived in the 17th century the region up to New Guinea was overwhelmingly Muslim with animist minorities.
Inner Asia and Eastern Europe 
One of the earliest introductions of Islam into Eastern Europe was through the work of an early 11th century Muslim prisoner who was captured by the Byzantines during their war against Muslims. The Muslim prisoner was brought into the territory of the Pechenegs where he taught and converted individuals to Islam. Little is known about the timeline of the Islamization of Inner Asia and the Turkic peoples who lay beyond the bounds of the caliphate. Around 7th century and 8th century, there were some states of Turkic peoples like Turkic Khazar Khaganate (See Khazar-Arab Wars) and Turkic Turgesh Khaganete who fought against the caliphate in order to stop Arabization and Islamization in Asia. From the 9th century onwards, the Turks (at least individually, if not yet through adoption by their states) began to convert to Islam. Histories merely note the fact of pre-Mongol Central Asia's Islamization. The Bulgars of the Volga are noted to have adopted Islam by the 10th century under Almış, to whom the modern Volga Tatars trace their Islamic roots. When the Friar William of Rubruck visited the encampment of Batu Khan of the Golden Horde, who had recently completed the Mongol invasion of Volga Bulgaria, he noted "I wonder what devil carried the law of Machomet there".
Another contemporary known to have been Muslim, was the Qarakhanid dynasty of the Kara-Khanid Khanate which lay much further east, and which was established by Karluks who were Islamizated after Battle of Talas. However, the modern day history of the Islamization of the region - or rather a conscious affiliation with Islam - dates to the reign of the ulus of the son of Genghis Khan, Jochi, who founded the Golden Horde. Kazakhs, Uzbeks and some Muslim populations of the Russian Federation trace their Islamic roots to the Golden Horde and while Berke Khan was the first Mongol monarch to officially adopt Islam and even oppose his kinsman Hulagu Khan in the defense of Jerusalem at the Battle of Ain Jalut, it was only much later that the change became pivotal and the Mongols converted en masse when a century later Uzbeg Khan converted - reportedly at the hands of the Sufi Saint Baba Tukles.
Some of the Mongolian tribes became Islamized. Following the brutal Mongol invasion of Central Asia under Hulagu Khan and after the Battle of Baghdad (1258) Mongol rule extended across the breadth of almost all Muslim lands in Asia, and the caliphate was destroyed and Islam was persecuted by the Mongols and replaced by Buddhism as the official religion of the land. In 1295 however, the new Khan of the Ilkhanate, Ghazan converted to Islam and two decades later the Golden Horde followed suit. The Mongols had been religiously and culturally conquered, this absorption ushered in a new age of Mongol-Islamic synthesis that shaped the further spread of Islam in central Asia and the Indian subcontinent.
In the 1330s the Mongol ruler of the Chagatai Khanate converted to Islam, causing the eastern part of his realm called Moghulistan to rebel. However during the next three centuries these Buddhist, Shamanistic and Christian Turkic and Mongol nomads of the Kazakh Steppe and Xinjiang would also convert at the hands of competing Sufi orders from both east and west of the Pamirs. The Naqshbandi's are the most prominent of these orders, especially in Kashgaria where the western Chagatai Khan was also a disciple of the order.
North Africa 
In Egypt, the victorious Muslims granted religious freedom to the Christian community in Alexandria, for example, and the Alexandrians quickly recalled their exiled Monophysite patriarch to rule over them, subject only to the ultimate political authority of the conquerors. In such a fashion the city persisted as a religious community under an Arab Muslim domination more welcome and more tolerant than that of Byzantium .
Byzantine rule was ended by the Arabs, who invaded Tunisia from 647-648 and Morocco in 682 in the course of their drive to expand the power of Islam. In 670, the Arab general and conqueror Uqba Ibn Nafi established the city of Kairouan (in Tunisia) and its Great Mosque also known as the Mosque of Uqba; the Great Mosque of Kairouan is the ancestor of all the mosques in the western Islamic world. Berber troops were used extensively by the Arabs in their conquest of Spain, which began in 711.
No previous conqueror had tried to assimilate the Berbers, but the Arabs quickly converted them and enlisted their aid in further conquests. Without their help, for example, Andalusia could never have been incorporated into the Islamicate state. At first only Berbers nearer the coast were involved, but by the 11th century Muslim affiliation had begun to spread far into the Sahara.
The conventional historical view is that the conquest of North Africa by the Islamic Umayyad Caliphate between AD 647–709 effectively ended Catholicism in Africa for several centuries. However, new scholarship has appeared that provides more nuance and details of the conversion of the Christian inhabitants to Islam. A Christian community is recorded in 1114 in Qal'a in central Algeria. There is also evidence of religious pilgrimages after 850 AD to tombs of Catholic saints outside of the city of Carthage, and evidence of religious contacts with Christians of Arab Spain. In addition, calendar reforms adopted in Europe at this time were disseminated amongst the indigenous Christians of Tunis, which would have not been possible had there been an absence of contact with Rome. During the reign of Umar II, the then governor of Africa, Ismail ibn Abdullah, was said to have won the Berbers to Islam by his just administration, and other early notable missionaries include Abdallah ibn Yasin who started a movement which caused thousands of Berbers to accept Islam.
Horn of Africa 
The history of commercial and intellectual contact between the inhabitants of the Somali coast and the Arabian Peninsula may help explain the Somali people's connection with the Prophet Muhammad. The early Muslims fled to the port city of Zeila in modern-day northern Somalia to seek protection from the Quraysh at the court of the Aksumite Emperor in present-day Ethiopia. Some of the Muslims that were granted protection are said to have then settled in several parts of the Horn region to promote the religion. The victory of the Muslims over the Quraysh in the 7th century had a significant impact on local merchants and sailors, as their trading partners in Arabia had then all adopted Islam, and the major trading routes in the Mediterranean and the Red Sea came under the sway of the Muslim Caliphs. Through commerce, Islam spread amongst the Somali population in the coastal cities. Instability in the Arabian peninsula saw further migrations of early Muslim families to the Somali seaboard. These clans came to serve as catalysts, forwarding the faith to large parts of the Horn region.
East Africa 
On the east coast of Africa, where Arab mariners had for many years journeyed to trade, mainly in slaves, Arabs founded permanent colonies on the offshore islands, especially on Zanzibar, in the 9th and 10th century. From there Arab trade routes into the interior of Africa helped the slow acceptance of Islam.
by the 10th century the Kilwa Sultanate was founded by Ali ibn al-Hassan Shirazi (was one of seven sons of a ruler of Shiraz, Persia, his mother an Abyssinian slave girl. Upon his father's death, Ali was driven out of his inheritance by his brothers). His successors would rule the most powerful of Sultanates in the Swahili coast, during the peak of its expansion the Kilwa Sultanate stretched from Inhambane in the south to Malindi in the north. The 13th century Muslim traveller Ibn Battuta noted that the great mosque of Kilwa Kisiwani was made of coral stone (the only one of its kind in the world).
In the 20th century, Islam grew in Africa both by birth and by conversion. The number of Muslims in Africa grew from 34.5 million in 1900 to 315 million in 2000, going from roughly 20% to 40% of the total population of Africa. However, in the same time period, the number of Christians also grew in Africa, from 8.7 million in 1900 to 346 million in 2000, surpassing both the total population as well as the growth rate of Islam on the continent.
Western Africa 
The spread of Islam in Africa began in the 7th to 9th century, brought to North Africa initially under the Umayyad Dynasty. Extensive trade networks throughout North and West Africa created a medium through which Islam spread peacefully, initially through the merchant class. By sharing a common religion and a common transliteralization (Arabic), traders showed greater willingness to trust, and therefore invest, in one another. Moreover, toward the 18th century, the Nigeria based Sokoto Caliphate led by Usman dan Fodio exerted considerable effort in spreading Islam.
Hispania /Al-Andalus 
The history of Arab and Islamic rule in the Iberian peninsula is probably one of the most studied periods of European history, but the variety and quantity of writing has not escaped the prejudices of the authors. For centuries after the Arab conquest, European accounts of Arab rule in Iberia were negative. European points of view started changing with the Protestant Reformation, which resulted in new descriptions of the period of Islamic rule in Spain as a "golden age" (mostly as a reaction against Spain's militant Roman Catholicism after 1500).
The tide of Arab expansion after 630 rolled through North Africa up to Ceuta in present day Morocco. Their arrival coincided with a period of political weakness in the three centuries old kingdom established in the Iberian peninsula by the Germanic Visigoths, who had taken over the region after seven centuries of Roman rule. Seizing the opportunity, an Arab-led (but mostly Berber) army invaded in 711, and by 720 had conquered almost all of the peninsula. The Arab expansion pushed over the mountains into southern France, and for a short period Arabs controlled the old Visigothic province of Septimania (centered on present-day Narbonne). The Arab Caliphate was pushed back by Charles Martel (King of the Franks or French) at Poitiers, and Christian armies started pushing southwards over the mountains, until Charlemagne established in 801 the Spanish March (which stretched from Barcelona to present day Navarre).
A major development in the history of Muslim Spain was the dynastic change in 750 in the Arab Caliphate, when an Umayyad Prince escaped the slaughter of his family in Damascus, fled to Cordoba in Spain, and created a new Islamic state in the area. This was the start of a distinctly Spanish Muslim society, where large Christian and Jewish populations coexisted with an increasing percentage of Muslims. There are many stories of descendants of Visigothic chieftains and Roman counts whose families converted to Islam during this period. The at-first small Muslim elite continued to grow with converts, and with a few exceptions, rulers in Islamic Spain allowed Christians and Jews the right specified in the Koran to practice their own religions, though it is true that non Muslims suffered from political and taxation inequities. The net result was, in those areas of Spain where Muslim rule lasted the longest, the creation of a society that was mostly Arabic-speaking because of the assimilation of native inhabitants, a process in some ways similar to the assimilation many years later of millions of immigrants to the United States into English-speaking culture.
The Islamic state centered in Cordoba ended up splintering into many smaller kingdoms (the so-called taifas). While Muslim Spain was fragmenting, the Christian kingdoms grew larger and stronger, and the balance of power shifted against the taifa kingdoms. The last Muslim kingdom of Granada in the south fell to Christian conquerors in 1492. In 1499, the remaining Muslim inhabitants were ordered to convert or leave (at the same time the Jews were expelled). Poorer Muslims (Moriscos) who could not afford to leave ended up converting to Catholic Christianity and hiding their Muslim practices, hiding from the Spanish Inquisition, until their presence was finally extinguished.
In Balkan history, writing the question of conversion to Islam was, and still is, a highly charged political issue. It is intrinsically linked to the issues of formation of national identities and rival territorial claims of the Balkan states. The generally accepted nationalist discourse of the current Balkan historiography defines all forms of Islamization as results of the Ottoman government's centrally organized policy of conversion or dawah. The truth is that Islamization in each Balkan country took place in the course of many centuries, and its nature and phase was determined not by the Ottoman government but by the specific conditions of each locality. Ottoman conquests were initially military and economic enterprises, and religious conversions were not the their primary objective. True, the statements surrounding victories all celebrated the incorporation of territory into Muslim domains, but the actual Ottoman focus was on taxation and making the realms productive, and a religious campaign would have disrupted that economic objective.
Ottoman Islamic standards of toleration allowed for autonomous "nations" (millets) in the Empire, under their own personal law and under the rule of their own religious leaders. As a result, vast areas of the Balkans remained mostly Christian during the period of Ottoman domination. In fact, the Eastern Orthodox Churches had a higher position in Ottoman Empire, mainly because the Patriarch resided in Istanbul and was an officer of the Ottoman Empire. In contrast, Roman Catholics, while tolerated, were suspected with loyalties to a foreign power (the Papacy). It is no surprise that the Roman Catholic areas of Bosnia, Kosovo and northern Albania, ended up with more substantial conversions to Islam. The defeat of the Ottomans in 1699 by the Austrians resulted in their loss of Hungary and present-day Croatia. The remaining Muslim converts in both elected to leave "lands of unbelief" and moved to territory still under the Ottomans. Around this point in time, new European ideas of romantic nationalism started to seep into the Empire, and provided the intellectual foundation for new nationalistic ideologies and the reinforcement of the self-image of many Christian groups as subjugated peoples.
As a rule, the Ottomans did not require followers of Greek Orthodoxy to become Muslims, although many did so in order to avert the socioeconomic hardships of Ottoman rule or because of the corruption of the Greek clergy. Indeed, the Greek Church hierarchy burdened Christians with extraordinary tax, and made them purchase, at high rates, the right of a Christian burial as well as other sacraments. The clergy were even said to carry off children and sell them as slaves. Another cause for conversion was the condition of the Greek church, which according to Thomas Walker Arnold arose to an "ecclesiastical despotism which had crushed all energy of intellectual life under the weight of dogmatism that interdicted all discussions in matters of morals and religion." According to Arnold, others turned away from the Greek Church and converted to Islam because of Islam's clear, intelligible teachings as opposed to the Christian doctrines which sparked endless discourse on such "trivialities as the use of leavened or unleavened bread in the Blessed Sacrament."
Islam was not spread by force in the areas under the control of the Ottoman Sultan. Rather Arnold concludes by quoting a 17th-century author who stated:
Meanwhile he (the Turk) wins (converts) by craft more than by force, and snatches away Christ by fraud out of the hearts of men. For the Turk, it is true, at the present time compels no country by violence to apostatise; but he uses other means whereby imperceptibly he roots out Christianity...
According to a historian,
We find that many Greeks of high talent and moral character were so sensible of the superiority of the Mohammedans, that even when they escaped being drafted into the Sultan's household as tribute children, they voluntarily embraced the faith of Mahomet. The moral superiority of the Othoman society must be allowed to have had as much weight in causing these conversions, which were numerous in the 15th century, as the personal ambition of individuals.
One by one, the Balkan nationalities asserted their independence from the Empire, and frequently the presence of members of the same ethnicity who had converted to Islam presented a problem from the point of view of the now dominant new national ideology, which narrowly defined the nation as members of the local dominant Orthodox Christian denomination. Thousand of Muslims chose to leave, and in some cases were expelled, to what was left of the Ottoman Empire. This demographic transition can be illustrated by the decrease in the number of Mosques in Belgrade, from over 70 in 1750 (before Serbian independence in 1815), to only three in 1850.
As an example of what most indigenous Muslims endured when the new Christian nation-states emerged in the 19th century, peninsular and Cretan Greeks, who saw themselves as Greek first and spoke the Greek language, eventually were still forced to leave Greece. In the long run, with the exception of Bosnia, Albania, and Kosovo, the vast majority of descendants of Balkan converts to Islam emigrated to Turkey and integrated themselves into Turkish society. Bosnia, Albania, and Kosovo like many other nations were also attacked by other nations to forcefully leave Islam, or else persecuted. In Albania, atheist regimes were so intense that Albania was eventually declared the first atheist state.
Since the 1960s, many Muslims have migrated to Western Europe. They have come as immigrants, guest workers, asylum seekers or as part of family reunification. As a result Muslim population in Europe has steadily risen.
The writer Bat Ye'or stated in her book "Eurabia" that Muslims may become a majority within a few generations due to continued immigration and high birth rates. This theory has been criticized, however. Many suggest the claims are built on unreliable claims and that fertility rates of Muslims will eventually decrease and that immigration to European nations could be limited.
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