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The majority religion in Saudi Arabia is Islam. Islam is the official religion of Saudi Arabia, and all citizens are legally accepted to be Muslims. The government does not legally protect the freedom of religion. As a matter of fact, any overseas national must convert to Islam, should he or she intend acquiring Saudi nationality.  There are many news report which criticize the Saudi government for its harsh implementation of Islamic rule, its double standards and its poor Human Rights record.
Religious groups 
The official form of Islam is Sunni of the Hanbali school, in its Salafi or Wahhabi version. Nearly 5-10% of the population are Shia Muslims. Two holiest cities of Islam, Mecca and Medina, are in Saudi Arabia. For many reasons, non-Muslims are not permitted to enter the holy cities, although there are reports of certain Westerners who disguised themselves as devout Muslims and were able to enter.
There are significant populations of Roman Catholics, Protestants and Orthodox Christians, primarily non-citizens from a variety of countries.
There is a significant population of Hindus, primarily non-citizens from India. Hindus are not permitted to worship in Saudi Arabia.
Freedom of religion 
Saudi Arabia is an Islamic theocracy, without protections on the rights of minorities to practice freedom of religion. Non-Muslim propagation is banned, and conversion from Islam to another religion is punishable by death as apostasy.