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Religious Adherents, 2010 (World Christian Database)1

Iran South-Central Asia World
Baha'i 0.3% 0.1% 0.1%
Buddhist <0.1% 1.6% 7.2%
Chinese Universalist <0.1% <0.1% 6.3%
Christian 0.4% 4.0% 32.8%
Confucianist 0.0% 0.0% 0.1%
Ethnoreligionist <0.1% 2.9% 3.5%
Hindu <0.1% 52.9% 13.8%
Jain 0.0% 0.3% <0.1%
Jewish <0.1% <0.1% 0.2%
Muslim 98.8% 35.8% 22.5%
Shintoist 0.0% <0.1% <0.1%
Sikh <0.1% 1.3% 0.3%
Spiritist 0.0% 0.0% 0.2%
Taoist 0.0% 0.0% 0.1%
Zoroastrian <0.1% <0.1% <0.1%
Neoreligionists <0.1% <0.1% 0.9%
Atheist <0.1% 0.1% 2.0%
Agnostic 0.3% 1.0% 9.8%

Religious Adherence, 2005 (other estimates)2

Sunni 7.6%
Shi'a 91.5%
Other 0.9%

Religious Demography3

The country has an area of 631,000 square miles and a population of 71.6 million. The population is 98 percent Muslim; 89 percent is Shi'a and 9 percent Sunni (mostly Turkmen and Arabs, Baluchs, and Kurds living in the southwest, southeast, and northwest respectively). Non-Muslims account for 2 percent of the population. There are no official statistics available on the size of the Sufi Muslim population; however, some reports estimate between two million and five million persons practice Sufism.

Recent unofficial estimates from religious organizations claim that Baha'is, Jews, Christians, Sabean-Mandaeans, and Zoroastrians constitute two percent of the total population. The largest non-Muslim minority is the Baha'i religious group, which numbers 300,000 to 350,000. Unofficial estimates of the Jewish community's size vary from 25,000 to 30,000.

According to U.N. figures, 300,000 Christians live in the country, the majority of whom are ethnic Armenians. Unofficial estimates for the Assyrian Christian population are between 10,000 and 20,000. There are also Protestant denominations, including evangelical religious groups. Christian groups outside the country estimate the size of the Protestant Christian community to be less than 10,000, although many Protestant Christians reportedly practice in secret. Sabean-Mandaeans number 5,000 to 10,000. The Government regards Sabean-Mandaeans as Christians, and they are included among the three recognized religious minorities; however, Sabean-Mandaeans do not consider themselves Christians. The Government estimates there are 30,000 to 35,000 Zoroastrians, a primarily ethnic Persian minority; however, Zoroastrian groups claim to have 60,000 adherents. There are indications that members of all religious minorities are emigrating at a high rate, although it is unclear if the reasons for emigration are religious or related to overall poor economic conditions.


Note: The World Christian Database (WCD) estimates, used in the Religious Adherents section above, count each person as belonging to a maximum of one religious group. For more information, see the WCD methodology document. The U.S. State Department's International Religious Freedom report estimates, used in the Religious Demography section, use less restrictive criteria in which a person who identifies with more than one religion is classified as a follower of each. In certain cases (such as Japan and other nations with strong folk religion traditions), this can cause counts to vary widely between estimates. Users are advised to consult the relevant source documents before determining which counts to cite.

1.  The World Christian Database (WCD) is based on the 2600-page award-winning World Christian Encyclopedia and World Christian Trends, first published in 1982 and revised in 2001. This extensive work on World religion is now completely updated and integrated into the WCD online database. Designed for both the casual user and research scholar, information is readily available on religious activities, growth rates, religious literature, worker activity, and demographic statistics. Additional secular data is incorporated on population, health, education, and communications. A dataset with these and the other international measures highlighted on the country pages can be downloaded from this website. Used with permission.

2.  The World Values Survey compiles nationally representative public opinion data of adults (18 or older) from a variety of countries. The general methodology is a stratified random sample with each country containing a minimum of 1000 cases. Estimates represent the proportion of respondents to the third wave of the World Values Survey (2005-2008) who reported the specific religious tradition in the country of consideration.

3.  The U.S. State Department's International Religious Freedom Report is submitted to Congress annually by the Department of State in compliance with Section 102(b) of the International Religious Freedom Act (IRFA) of 1998. This report supplements the most recent Human Rights Reports by providing additional detailed information with respect to matters involving international religious freedom. It includes individual country chapters on the status of religious freedom worldwide. A dataset with these and the other international measures highlighted on the country pages can be downloaded from this website. These State Department reports are open source.