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Early Christianity is the period of Christianity preceding the First Council of Nicaea in 325. It is typically divided into the Apostolic Age and the Ante-Nicene Period (from the Apostolic Age until Nicea).
The first Christians, as described in the first chapters of the Acts of the Apostles, were all Jewish, either by birth, or conversion for which the biblical term proselyte is used, and referred to by historians as the Jewish Christians. The New Testament's Book of Acts and Epistle to the Galatians record that the first Christian community was centered in Jerusalem and its leaders included Peter, James, and John. Paul of Tarsus, after his conversion to Christianity, claimed the title of "Apostle to the Gentiles". Paul's influence on Christian thinking is said to be more significant than any other New Testament writer. By the end of the 1st century, Christianity began to be recognized internally and externally as a separate religion from Rabbinic Judaism which itself was refined and developed further in the centuries after the destruction of the Second Jerusalem Temple.
As shown by the numerous quotations in the New Testament books and other Christian writings of the 1st centuries, early Christians generally used and revered the Jewish Bible as Scripture, mostly in the Greek (Septuagint) or Aramaic (Targum) translations, much of which is written in narrative form where "in the biblical story God is the protagonist, Satan (or evil people/powers) are the antagonists, and God's people are the agonists".
As the New Testament canon developed, the Letters of Paul, the Canonical Gospels and various other works were also recognized as scripture to be read in church. Paul's letters, especially Romans, established a theology based on Christ rather than on the Mosaic Law, but most Christian denominations today still consider the "moral prescriptions" of the Mosaic Law, such as the Ten Commandments, Great Commandment, and Golden Rule, to be relevant. Early Christians demonstrated a wide range of beliefs and practices, many of which were later rejected as heretical.
The earliest followers of Jesus composed an apocalyptic, Second Temple Jewish sect, which historians refer to as Jewish Christianity. The first part of the period, during the lifetimes of the Twelve Apostles, is called the Apostolic Age. In line with the Great Commission attributed to the resurrected Jesus, the Apostles are said to have dispersed from Jerusalem, and the missionary activity spread Christianity to cities throughout the Hellenistic world and even beyond the Roman Empire. Though Paul's influence on Christian thinking is said to be more significant than any other New Testament author, the relationship of Paul of Tarsus and Judaism is still disputed.
Early Christians suffered sporadic persecution because they refused to pay homage to the emperor as divine. Persecution was on the rise in Asia Minor towards the end of the 1st century, as well as in Rome in the aftermath of the Great Fire of Rome in AD 64.
During the Ante-Nicene period following the Apostolic Age, a great diversity of views emerged simultaneously with strong unifying characteristics lacking in the apostolic period. Part of the unifying trend was an increasingly harsh rejection of Judaism and Jewish practices. Early Christianity gradually grew apart from Judaism during the first two centuries and established itself as a predominantly gentile religion in the Roman Empire.
According to Will Durant, the Christian Church prevailed over Paganism because it offered a much more attractive doctrine and because the church leaders addressed human needs better than their rivals.
From the writings of early Christians, historians have tried to piece together an understanding of various early Christian practices including worship services, customs and observances. Early Christian writers such as Justin Martyr (100 – 165) described these practices.
Early Christian beliefs regarding baptism probably predate the New Testament writings. It seems certain that numerous Jewish sects and certainly Jesus and his disciples practised baptism, which became integral to nearly every manifestation of the religion of the Jews. John the Baptist had baptized many people before baptisms took place in the name of Jesus Christ. Many of the interpretations that would later become orthodox Christian beliefs concerning baptism can be traced to apostles such as Paul, who likened baptism to being buried with Christ in his death (Romans 6:3,4; Colossians 2:12). On the basis of this description, it was supposed by some modern theologians that the early Christians practised baptism by submersion (Matthew 3:13-17). This interpretation is debated between those Christian denominations who advocate immersion baptism exclusively and those who practice baptism by affusion or aspersion as well as by immersion. Yet the Didache, one of the earliest Christian writings on liturgical practices, mentions that baptism may occur by pouring water on the head three times using the trinitarian formula (i.e., in the name of the Father, the Son, and the Holy Spirit).
While some believe that infant baptism began to be widely practised at least by the 3rd century, the origins of the practice are controversial. Some believe that the Church in apostolic period practised infant baptism, arguing that the mention of the baptism of households in the Acts of the Apostles most definitely would have included children within the household. In the 2nd century, Irenaeus, bishop of Lyons, may have referred to it.
The 3rd century evidence is clearer, with both Origen and Cyprian advocating the practice. Tertullian refers to the practice (and that sponsors would speak on behalf of the children), but argues against it, on the grounds that baptism should be postponed until after marriage.
Interpretation of the baptismal practices of the early church is important to groups such as Baptists and Anabaptists, who believe that infant baptism was a later development, yet the early Christian writings mentioned above, which date from the 2nd and 3rd century clearly show that the early Christians did maintain such practice.
Christian groups and congregations first organized themselves loosely. In Paul's time, although certain decisions by Elders and Apostles were binding, as in the Council of Jerusalem, there were no precisely delineated functions yet for bishops, elders, and deacons. A Church hierarchy, however, seems to have developed by the late 1st century and early 2nd century (see Pastoral Epistles, c 90 - 140). These structures were certainly formalized well before the end of the Early Christian period, which concluded with the legalization of Christianity by Constantine's Edict of Milan in 313 and the holding of the First Council of Nicea in 325, when the title of Metropolitan bishop first appears.
In the post-Apostolic church, bishops emerged as overseers of urban Christian populations, and a hierarchy of clergy gradually took on the form of episkopoi (overseers), presbyteroi (elders), and diakonoi (ministerial servants). This hierarchy emerged slowly and at different times for different locations. Clement, a 1st-century bishop of Rome, refers to the leaders of the Corinthian church in his epistle to Corinthians as bishops and presbyters interchangeably. The New Testament writers also use the terms "overseer" and "elder" interchangeably and as synonyms. The Didache (dated by most scholars to the early 2nd century), speaks of "appointing for yourself bishops and deacons".
Disputes regarding the proper titles and roles of church leaders would later become one of the major causes of schism within the Christian church. Such disputes include the roles of bishops and presbyters. Churches such as the Catholic and Orthodox use the word "priest" of all the baptized, but apply it in a more specific sense ("ministerial priesthood") to bishops and presbyters and sometimes, somewhat loosely, treat "presbyter" and "priest" as synonyms, applying both terms to clergy subordinate to bishops. In congregational churches, the title "priest" is rejected, keeping only "presbyter" or "elder". Some congregational churches do not include a role of bishop in their organizational polity.
Post-apostolic bishops of importance include Polycarp of Smyrna, Ignatius of Antioch and Clement of Rome . These men reportedly knew and studied under the apostles personally and are therefore called Apostolic Fathers. Each Christian community also had presbyters, as was the case with Jewish communities, who were also ordained and assisted the bishop; as Christianity spread, especially in rural areas, the presbyters exercised more responsibilities and took distinctive shape as priests. Lastly, deacons also performed certain duties, such as tending to the poor and sick. In the 2nd century, an episcopal structure becomes more visible, and in that century this structure was supported by teaching on apostolic succession, where a bishop becomes the spiritual successor of the previous bishop in a line tracing back to the apostles themselves.
By the end of the early Christian period, the church within the Roman Empire had hundreds of bishops, some of them (Rome, Alexandria, Antioch, "other provinces") holding some form of jurisdiction over others.
Jerusalem was the first church and an important church center up to 135. The First Council of Nicaea recognized and confirmed the tradition by which Jerusalem continued to be given "special honour", but did not assign to it even metropolitan authority within its own province, still less the extraprovincial jurisdiction exercised by Rome and the other sees mentioned above.
Constantinople came into prominence only after the early Christian period, being founded officially in 330, five years after the First Council of Nicaea, though the much smaller original city of Byzantium was an early center of Christianity largely due to its proximity to Anatolia.
The attitude of the Church Fathers towards women paralleled rules in Jewish law regarding a woman's role in worship, although the early church allowed women to participate in worship - something that was not allowed in the Synagogue (where women were restricted to the outer court).
The First Epistle to Timothy teaches that women should remain quiet during public worship and were not to instruct men or assume authority over them. Women were regarded both as "God's good gift to men" and as "weak in both mind and character", and women were called upon to submit to the authority of their husbands.
Despite the teachings in the epistles, the New Testament provides several examples of female ministers and church leaders, including Phoebe (a church deacon in Corinth), Priscilla (an early missionary and one of the Seventy Disciples) and Lydia (who hosted a house church in the Asian city of Thyatira).
Early Christian congregations apparently provided members with a strong sense of community, with mutual religious and material support.
Early Christian beliefs were based on the apostolic preaching (kerygma), considered to be preserved in tradition and in New Testament scripture, for parts of which scholars have posited dates as late as the third century, although it was then attributed to the Apostles themselves and their contemporaries, such as Mark and Luke.
Divinity of Christ 
Most Christians identified Jesus as divine from a very early period, although holding a variety of competing views as to what exactly this implied. Early Christian views tended to see Jesus as a unique agent of God; by the Council of Nicaea in 325 he was identified as God in the fullest sense, being 'of the same substance, essence or being'.
Some of the 1st and 2nd-century texts that would later be canonized as the New Testament several times imply or indirectly refer to the divine character to Jesus, though there is scholarly debate as to whether or not they call him God Within 15–20 years of the death of Jesus, Paul, who authored the largest early expositions of Christian theology, refers to Jesus as the resurrected "Son of God", the savior who would return from heaven and save his faithful, dead and living, from the imminent destruction of the world. The Synoptic Gospels describe him as the "Son of God", though the phrase "Son of Man" (always placed in the mouth of Jesus himself) is more frequently used in the Gospel of Mark; born of the Virgin Mary by the agency of the Holy Spirit, and who will return to judge the nations. The Gospel of John identifies Jesus as the human incarnation of the divine Word or "Logos" (see Jesus the Logos) and True Vine. It is believed that the Book of Revelation depicts Jesus as "the Alpha and the Omega, the first and the last, the beginning and the end" (22:13), and applies similar terms to "the Lord God": "'I am the Alpha and the Omega,' says the Lord God, 'who is and who was and who is to come, the Almighty'" (1:8).
The term "Logos" was used in Greek philosophy (see Heraclitus) and in Hellenistic Jewish religious writing (see Philo Judaeus of Alexandria) to mean the ultimate ordering principle of the universe. Those who rejected the identification of Jesus with the Logos, rejecting also the Gospel of John, were called Alogi (see also Monarchianism).
Adoptionists, such as the Ebionites, considered him as at first an ordinary man, born to Joseph and Mary, who later became the Son of God at his baptism, his transfiguration, or his resurrection.
Rodney Stark estimates that the number of Christians grew by approximately 40% a decade during the first and second centuries. This phenomenal growth rate forced Christian communities to evolve in order to adapt to their changes in the nature of their communities as well as their relationship with their political and socioeconomic environment. As the number of Christians grew, the Christian communities became larger, more numerous and farther apart geographically. The passage of time also moved some Christians farther from the original teachings of the apostles giving rise to teachings that were considered heterodox and sowing controversy and divisiveness within churches and between churches.
Robert Haight[who?] posits the development of ecclesiology in the form of "Early Catholicism" as one response to the problem of church unity. Thus, the solution to division arising from heterodox teaching was the development of "tighter and more standardized structures of ministry. One of these structures is the tri-partite form of church leadership consisting of bishops, elders and deacons that Ignatius of Antioch urged churches to adopt, writing that "You cannot have a church without these." Over the course of the second century, this organizational structure became universal and continues to be used in the Catholic, Orthodox and Anglican churches as well as in some Protestant denominations.
Despite its mention of bishops, there is no clear evidence in the New Testament that supports the concepts of dioceses and monepiscopacy (i.e. the rule that all the churches in a geographic area should be ruled by a single bishop). Scholars point to evidence that Christian communities such as Rome had many bishops and that the concept of monepiscopacy was still emerging when Ignatius was urging his tri-partite structure on other churches.
Robert Williams posits that the "origin and earliest development of episcopacy and monepiscopacy and the ecclesiastical concept of (apostolic) succession were associated with crisis situations in the early church."
Orthodoxy and heterodoxy 
The proto-orthodox church had a dichotomy for teachings; they were either orthodox or heterodox. Orthodox teachings were those that had the authentic lineage of Holy Tradition. All other teachings were viewed as deviant streams of thought and were possibly heretical. An important discussion in the past century among scholars of early Christianity is to what extent it is still appropriate to speak of "orthodoxy" and "heresy". Higher criticism drastically altered the previous perception that heresy was a very rare exception to the orthodoxy. Some orthodox scholars argue against the increasing focus on heterodoxy. A movement away from presuming the correctness or dominance of the orthodoxy is seen as understandable, in light of modern approaches. However, these orthodox scholars feel that instead of an even and neutral approach to historical analysis that the heterodox sects are given an assumption of superiority over the orthodox movement.
Religious writing 
Early Christians wrote many religious works, some of which were later canonized as the New Testament of today.
Defining scripture 
Debates about scripture were underway in the mid-2nd century, concurrent with a drastic increase of new scriptures, both Jewish and Christian. Debates regarding practice and belief gradually became reliant on the use of scripture other than what Melito referred to as the Old Testament, as the New Testament canon developed. Similarly, in the 3rd century a shift away from direct revelation as a source of authority occurred, most notably against the Montanists. "Scripture" still had a broad meaning and usually referred to the Septuagint among Greek speakers or the Targums among Aramaic speakers or the Vetus Latina translations in Carthage. Beyond the Torah (the Law) and some of the earliest prophetic works (the Prophets), there was not agreement on the canon, but this was not debated much at first. By the mid-2nd century, tensions arose with the split of early Christianity and Judaism, which some theorize led eventually to the determination of a Jewish canon by the emerging rabbinic movement, though, even as of today, there is no scholarly consensus as to when the Jewish canon was set. For example some scholars argue that the Jewish canon was fixed earlier, by the Hasmonean dynasty (140-137 BC).
A problem for scholars is that there is a lack of direct evidence on when Christians began accepting their own scriptures alongside the Septuagint. Well into the 2nd century Christians held onto a strong preference for oral tradition as clearly demonstrated by writers of the time, such as Papias.
Koine Greek spread all over the Empire, even up the Rhone valley of Gaul; Roman satirists complained that even Rome had become a Greek city. Thus the Greek translation of the Hebrew Scriptures (the Septuagint) was the dominant translation (even the Peshitta appears to be influenced). Later Jerome would express his preference for adhering strictly to the Hebrew text and canon, but his view held little currency even in his own day. It was not until the Protestant Reformation that substantial numbers of Christians began to reject those books of the Septuagint which are not found in the Jewish Masoretic Text, referring to them as biblical apocrypha. In addition, some New Testament books were also disputed, known as the Antilegomena.
Fathers of the church 
Since the end of the 4th century, the title "Fathers of the Church" has been used to refer to a more or less clearly defined group of ecclesiastical writers who are appealed to as authorities on doctrinal matters. Orthodoxy of doctrine, holiness of life, approval by the Church and antiquity are traditionally considered conditions for classification as a Father of the Church, but modern writers sometimes include Tertullian, Origen and a few others.
Apostolic Fathers 
The earliest Christian writings (other than those collected in the New Testament) are a group of letters credited to the Apostolic Fathers. These include the Epistle of Barnabas, the Shepherd of Hermas and the Epistles of Clement, as well as the Didache. Taken as a whole, the collection is notable for its literary simplicity, religious zeal and lack of Hellenistic philosophy or rhetoric. Fathers such as Ignatius of Antioch (died 98 to 117) advocated the authority of the apostolic episcopacy (bishops).
Spread of Christianity 
Early Christianity spread from city to city throughout the Hellenized Roman Empire and beyond into East Africa and South Asia. The Christian Apostles, said to have dispersed from Jerusalem, traveled extensively and established communities in major cities and regions throughout the Empire. The original church communities were founded in northern Africa, Asia Minor, Armenia, Arabia, Greece, and other places. by apostles (see Apostolic see) and other Christian soldiers, merchants, and preachers. Over forty were established by the year 100, many in Asia Minor, such as the seven churches of Asia. By the end of the 1st century, Christianity had spread to Greece and Italy, even India.
In 301 AD, the Kingdom of Armenia became the first state to declare Christianity as its official religion, following the conversion of the Royal House of the Arsacids in Armenia. The Armenian Apostolic Church is the world's oldest national church.
There is no agreement on an explanation of how Christianity managed to spread so successfully prior to the Edict of Milan. For some Christians, the success was simply the natural consequence of the truth of the religion and the hand of Providence. However, similar explanations are claimed for the spread of, for instance, Islam and Buddhism. In The Rise of Christianity, Rodney Stark argues that Christianity triumphed over paganism chiefly because it improved the lives of its adherents in various ways. Another factor, more recently pointed out, was the way in which Christianity combined its promise of a general resurrection of the dead with the traditional Greek belief that true immortality depended on the survival of the body, with Christianity adding practical explanations of how this was going to actually happen at the end of the world. For Mosheim the rapid progression of Christianity was explained by two factors: translations of the New Testament and the Apologies composed in defence of Christianity. Edward Gibbon, in his classic The History of the Decline and Fall of the Roman Empire, discusses the topic in considerable detail in his famous Chapter Fifteen, summarizing the historical causes of the early success of Christianity as follows: "(1) The inflexible, and, if we may use the expression, the intolerant zeal of the Christians, derived, it is true, from the Jewish religion, but purified from the narrow and unsocial spirit which, instead of inviting, had deterred the Gentiles from embracing the law of Moses. (2) The doctrine of a future life, improved by every additional circumstance which could give weight and efficacy to that important truth. (3) The miraculous powers ascribed to the primitive church. (4) The pure and austere morals of the Christians. (5) The union and discipline of the Christian republic, which gradually formed an independent and increasing state in the heart of the Roman empire."
See also 
- Ante-Nicene Fathers
- Christian primitivism
- Christianity in the 1st century
- Christianity in the 2nd century
- Christianity in the 3rd century
- Christian Torah-submission
- Constantine I and Christianity
- Constantinian shift
- Council of Jerusalem
- Early centers of Christianity
- Early Christian art and architecture
- Great Church
- History of Christianity
- Society for the Study of Early Christianity
- Split of early Christianity and Judaism
- State church of the Roman Empire
- Catholic Encyclopedia: Proselyte: "The English term "proselyte" occurs only in the New Testament where it signifies a convert to the Jewish religion (Matthew 23:15; Acts 2:11; 6:5; etc.), though the same Greek word is commonly used in the Septuagint to designate a foreign sojourner in Palestine. Thus the term seems to have passed from an original local and chiefly political sense, in which it was used as early as 300 B.C., to a technical and religious meaning in the Judaism of the New Testament epoch."
- Galatians 2:9, Acts 1:13; See Historical reliability of the Acts of the Apostles for details
- Oxford Dictionary of the Christian Church ed. F.L. Lucas (Oxford) entry on Paul
-  A View From Above – The Bible's Big Picture - Greg Chaney
-  How to Read the Bible for All Its Worth - Gordon D. Fee - Douglas Stuart - Harper Collins Publishing
- Ehrman 2004, p. 318 - "If the letter [1 Peter] is indeed associated with Asia Minor, as its prescript suggests, it should probably be assigned to the first century, possibly near its end, when persecution of the Christians was on the rise"
- Durant, Will. Caesar and Christ. New York: Simon and Schuster. 1972
- Gregg Strawbridge, Ph.D.; John Calvin, Institutes of the Christian Religion; Jordan Bajis; Bryan Chapell; Gregg Strawbridge (response to objections)
- "He (Jesus) came to save all through means of Himself — all, I say, who through Him are born again to God and children, infants, and boys, and youths, and old men" (Adversus Haereses, ii, 22, 4)
- Paul King Jewett, Infant Baptism and the Covenant of Grace, (Eerdmans 1978), page 127.
- Homilies on Leviticus 8.3.11; Commentary on Romans 5.9; and Homily on Luke 14.5
- "The delay of baptism is preferable; principally, however, in the case of little children. For why is it necessary ... that the sponsors likewise should be thrust into danger? ... For no less cause must the unwedded also be deferred - in whom the ground of temptation is prepared, alike in such as never were wedded by means of their maturity, and in the widowed by means of their freedom - until they either marry, or else be more fully strengthened for continence" (On Baptism 18).
- "The Didache, representing practice perhaps as early as the beginning of the second century, probably in Syria, also assumes immersion to be normal, but it allows that if sufficient water for immersion is not at hand, water may be poured three times over the head. The latter must have been a frequent arrangement, for it corresponds with most early artistic depictions of baptism, in Roman catacombs and on sarcophagi of the third century and later. The earliest identifiable Christian meeting house known to us, at Dura Europos on the Euphrates, contained a baptismal basin too shallow for immersion. Obviously local practice varied, and practicality will often have trumped whatever desire leaders may have felt to make action mime metaphor" (Margaret Mary Mitchell, Frances Margaret Young, K. Scott Bowie, Cambridge History of Christianity, Vol. 1, Origins to Constantine (Cambridge University Press 2006 ISBN 978-0-521-81239-9), pp. 160-161).
- Apostolic Presbyterianism - by William Cunningham and Reg Barrow
- Harris, Stephen L., Understanding the Bible. Palo Alto: Mayfield. 1985.
- presbyter. CollinsDictionary.com. Collins English Dictionary - Complete & Unabridged 11th Edition. Retrieved October 06, 2012.
- Philip Carrington, The Early Christian Church (2 vol. 1957) online edition vol 1; online edition vol 2
- Metzger, Bruce. The canon of the New Testament. 1997
- Catechism of the Catholic Church, 1120
- Catechism of the Catholic Church, 1554
- Catechism of the Catholic Church, 1562-1568
- Γ. Μπαμπινιώτη Λεξικό για το σχολείο & το γραφείο (Κέντρο Λεξικολογίας Αθήνα 2004 ISBN 960-86190-4-1)
- Canon VI of the First Council of Nicea, which closes the period under consideration in this article, reads: "Let the ancient customs in Egypt, Libya and Pentapolis prevail, that the Bishop of Alexandria have jurisdiction in all these, since the like is customary for the Bishop of Rome also. Likewise in Antioch and the other provinces, let the Churches retain their privileges. And this is to be universally understood, that if any one be made bishop without the consent of the Metropolitan, the great Synod has declared that such a man ought not to be a bishop ..." As can be seen, the title of "Patriarch", later applied to some of these bishops, was not used by the Council: "Nobody can maintain that the bishops of Antioch and Alexandria were called patriarchs then, or that the jurisdiction they had then was co-extensive with what they had afterward, when they were so called" (ffoulkes, Dictionary of Christian Antiquities, quoted in Volume XIV of Philip Schaff's The Seven Ecumenical Councils).
- See, for example, Council of Jerusalem and Early centers of Christianity#Jerusalem.
- "Since there prevails a custom and ancient tradition to the effect that the bishop of Aelia is to be honoured, let him be granted everything consequent upon this honour, saving the dignity proper to the metropolitan" (Canon 7).
- R. J. Bauckham (1982). "Sabbath and Sunday in the Post-Apostolic church". In D. A. Carson. From Sabbath to Lord's Day (Zondervan): 252–298
- "1 Timothy 2 NIV". BibleGateway. Retrieved October 7, 2012.
- Clark, Elizabeth Ann (1983). Women in the early church. Liturgical Press. p. 15. ISBN 978-0-8146-5332-6.
- "Ephesians 5 NIV". Retrieved October 7, 2012.
- "Romans 16:1-2 (New International Version)". Retrieved February 17, 2013.
- "Romans 16:3-5 (New International Version)". Retrieved February 17, 2013.
- "Acts 16:40 (New International Version)". Retrieved February 17, 2013.
- "Acts 16:14-15 (New International Version)". Retrieved February 17, 2013.
- Dodds, E.R. (1970) . Pagan and christian in an Age of Anxiety. New York: Norton. pp. 136–137. "A Christian congregation was from the first a community in a much fuller sense than any corresponding group of Isiac or Mithraist devotees. Its members were bound together not only by common rites but by a common way of life . ... Love of one's neighbour is not an exclusively Christian virtue, but in [this] period Christians appear to have practised it much more effectively an any other group. The Church provided the essentials of social security. ... But even more important, I suspect, than these material benefits was the sense of belonging which the Christian community could give." Quoted in Stark, Rodney (1996). The Rise of Christianity: A Sociologist Reconsiders History. Princeton University Press. p. 207. ISBN 9780691027494. Retrieved 2013-01-23.
- Larry Hurtado, Lord Jesus Christ: Devotion to Jesus in Earliest Christianity, (Eerdmans, 2005), page 650.
- Larry Hurtado, Lord Jesus Christ: Devotion to Jesus! in Earliest Christianity, (Eerdmans, 2005), page 204.
- Brown, Raymond E. (1965). "Does the New Testament call Jesus God?". Theological Studies 26: 545–73.
- "Alogi or Alogoi", Early Church.org.uk.
- "Alogi", Francis P. Havey, The Catholic Encyclopedia Volume I, 1907.
- Stark, Rodney (9 May 1997). The Rise of Christianity. HarperCollins. ISBN 978-0-06-067701-5. Retrieved 28 October 2012.
- Haight, Roger D. (16 September 2004). Christian Community in History Volume 1: Historical Ecclesiology. Continuum International Publishing Group. pp. 83–84. ISBN 978-0-8264-1630-8. Retrieved 26 October 2012. "The churches were becoming ever more distant from their origins in space and time. They were growing and with growth came new or false teachings, the sources of controversy and division."
- Ronald Y.K. Fung as cited in John Piper; Wayne Grudem (8 August 2006). Recovering Biblical Manhood and Womanhood: A Response to Evangelical Feminism. Crossway. p. 254. ISBN 978-1-4335-1918-5. Retrieved 28 October 2012.
- Williams, Robert Lee (2005). Bishop Lists: Formation of Apostolic Succession of Bishops in Ecclesiastical Crises. Gorgias Press LLC. p. 6. ISBN 978-1-59333-194-8. Retrieved 28 October 2012.
- Esler (2004). Pp 893-894.
- White (2004). Pp 446-447.
- Philip R. Davies, in The Canon Debate, page 50: "With many other scholars, I conclude that the fixing of a canonical list was almost certainly the achievement of the Hasmonean dynasty."
- Swete's Introduction to the Old Testament in Greek, page 112
- Cross, F. L., ed. The Oxford Dictionary of the Christian Church. New York: Oxford University Press. 2005, article Fathers of the Church
- Ephesians 5-6, Magnesians 2, 6-7, 13, Trallians 2-3, Smyrnaeans 8-9
- Vidmar, The Catholic Church Through the Ages (2005), pp. 19–20
- Hitchcock, Geography of Religion (2004), p. 281, quote: "By the year 100, more than 40 Christian communities existed in cities around the Mediterranean, including two in North Africa, at Alexandria and Cyrene, and several in Italy."
- Bokenkotter, A Concise History of the Catholic Church (2004), p. 18, quote: "The story of how this tiny community of believers spread to many cities of the Roman Empire within less than a century is indeed a remarkable chapter in the history of humanity."
- Franzen 29
- Michael Whitby, et al. eds. Christian Persecution, Martyrdom and Orthodoxy (2006) online edition
- Rodney Stark. The Rise of Christianity. Princeton: Princeton University Press 1996.
- Dag Øistein Endsjø. Greek Resurrection Beliefs and the Success of Christianity. New York: Palgrave Macmillan 2009.
- Moishem, Johann Lorenz von, The Ecclesiastical History of the Second and Third Centuries : Illustrated from the Writings of Tertullian, F. & J. Rivington, London, 1845, p. 106
- Gibbon, Edward, History of the Decline and Fall of the Roman Empire, Chapter Fifteen. in 6 volumes at the Internet Archive.
- Berard, Wayne Daniel. When Christians Were Jews (That Is, Now). Cowley Publications (2006). ISBN 1-56101-280-7.
- Boatwright, Mary Taliaferro & Gargola, Daniel J & Talbert, Richard John Alexander. The Romans: From Village to Empire. Oxford University Press (2004). ISBN 0-19-511875-8.
- Dauphin, C. "De l'Église de la circoncision à l'Église de la gentilité – sur une nouvelle voie hors de l'impasse". Studium Biblicum Franciscanum. Liber Annuus XLIII (1993).
- Dunn, James D.G. Jews and Christians: The Parting of the Ways, A.D. 70 to 135. Pp 33–34. Wm. B. Eerdmans Publishing (1999). ISBN 0-8028-4498-7.
- Ehrman, Bart D. Misquoting Jesus: The Story Behind Who Changed the Bible and Why. HarperCollins (2005). ISBN 0-06-073817-0.
- Endsjø, Dag Øistein. Greek Resurrection Beliefs and the Success of Christianity. New York: Palgrave Macmillan 2009.
- Esler, Phillip F. The Early Christian World. Routledge (2004). ISBN 0-415-33312-1.
- Harris, Stephen L. Understanding the Bible. Mayfield (1985). ISBN 0-87484-696-X.
- Hinson, E. Glenn The Early Church: Origins to the Dawn of the Middle Ages. Abingdon Press (1996). ISBN 0-687-00603-1.
- Hunt, Emily Jane. Christianity in the Second Century: The Case of Tatian. Routledge (2003). ISBN 0-415-30405-9.
- Keck, Leander E. Paul and His Letters. Fortress Press (1988). ISBN 0-8006-2340-1.
- Pelikan, Jaroslav Jan. The Christian Tradition: The Emergence of the Catholic Tradition (100-600). University of Chicago Press (1975). ISBN 0-226-65371-4.
- Pritz, Ray A., Nazarene Jewish Christianity From the End of the New Testament Period Until Its Disappearance in the Fourth Century. Magnes Press - E.J. Brill, Jerusalem - Leiden (1988).
- Richardson, Cyril Charles. Early Christian Fathers. Westminster John Knox Press (1953). ISBN 0-664-22747-3.
- Stark, Rodney.The Rise of Christianity. Harper Collins Pbk. Ed edition 1997. ISBN 0-06-067701-5
- Stambaugh, John E. & Balch, David L. The New Testament in Its Social Environment. John Knox Press (1986). ISBN 0-664-25012-2.
- Tabor, James D. "Ancient Judaism: Nazarenes and Ebionites", The Jewish Roman World of Jesus. Department of Religious Studies at the University of North Carolina at Charlotte (1998).
- Taylor, Joan E. Christians and the Holy Places: The Myth of Jewish-Christian Origins. Oxford University Press (1993). ISBN 0-19-814785-6.
- Thiede, Carsten Peter. The Dead Sea Scrolls and the Jewish Origins of Christianity. Palgrabe Macmillan (2003). ISBN 1-4039-6143-3.
- Valantasis, Richard. The Making of the Self: Ancient and Modern Asceticism. James Clarke & Co (2008) ISBN 978-0-227-17281-0.
- White, L. Michael. From Jesus to Christianity. HarperCollins (2004). ISBN 0-06-052655-6.
- Wright, N.T. The New Testament and the People of God. Fortress Press (1992). ISBN 0-8006-2681-8.
- Wylen, Stephen M. The Jews in the Time of Jesus: An Introduction. Paulist Press (1995). ISBN 0-8091-3610-4.
- Early Christians
- Early Christian Writings
- Christian Classics Ethereal Library
- Early Church Texts
- The Early Christians in Their Own Words (free Ebook – English or Arabic)
- Catholic Encyclopedia: The Fathers of the Church
- PBS Frontline: The First Christians
- "The Old Testament of the Early Church" Revisited, Albert C. Sundberg, Jr.
- The Jewish Roman World of Jesus
- Early Christian Sites in Ireland