The world's principal religions and spiritual traditions may be classified into a small number of major groups, although this is by no means a uniform practice. This theory began in the 18th century with the goal of recognizing the relative levels of civility in non-European societies. However, it quickly transformed into a subset of the universalist belief that all religious figures teach of a single, cross-cultural truth.
For a more comprehensive list of religions and an outline of some of their basic relationships, please see the article list of religions.
In world cultures, there have traditionally been many different groupings of religious belief. In India and China, different religious philosophies were traditionally respected as academic differences in pursuit of the same truth. In Islam, the Qur'an mentions three different categories: Muslims, the People of the Book, and idol worshipers. To some extent these theories of religiousness are still prevalent today. However, the most common classification today was birthed out of Western Christianity.
Initially, Christians had a simple dichotomy of world beliefs: Christian civility versus foreign heresy or barbarity. In the eighteenth century, "heresy" was clarified to mean Judaism and Islam; along with outright paganism, this created a fourfold classification which spawned such works as John Toland's Nazarenus, or Jewish, Gentile, and Mahometan Christianity, which represented the three Abrahamic traditions as different "nations" or sects within religion itself, the true monotheism. At the turn of the 18th century, in between 1780 and 1810, the language dramatically changed: instead of "religion" being synonymous with spirituality, authors began using the plural, "religions", to refer to both Christianity and other forms of worship. This new definition was described as follows by Daniel Defoe: "Religion is properly the Worship given to God, but 'tis also applied to the Worship of Idols and false Deities."
In 1838, the four-way division of Christianity, Judaism, "Mahommedanism" and Paganism was multiplied considerably by Josiah Conder's Analytical and Comparative View of All Religions Now Extant among Mankind. Conder's work still adheres to the four-way classification, but in his eye for detail he puts together much historical work to create something resembling our modern Western image: he includes Druze, Yezidis, Mandeans, and Elamites under a list of possibly monotheistic groups, and under the final category, of "polytheism and pantheism", he lists Zoroastrianism, "Vedas, Puranas, Tantras, Reformed sects" of India as well as "Brahminical idolatry", Buddhism, Jainism, Sikhism, "Lamaism", "religion of China and Japan", and "illiterate superstitions".
Even through the late nineteenth century, it was common to view these "pagan" sects as dead traditions which preceded Christianity, the final, complete word of God. This in no way reflected the reality of religious experience: Christians supposed these traditions to have maintained themselves in an unchanging state since whenever they were "invented", but actually all traditions survived in the words and deeds of people, some of whom could make radical new inventions without needing to create a new sect. The biggest problem in this approach was the existence of Islam, a religion which had been "founded" after Christianity, and which had been experienced by Christians as intellectual and material prosperity. By the nineteenth century, however, it was possible to dismiss Islam as a revelation of "the letter, which killeth", given to savage desert nomads. In this context, the term "world religion" referred only to Christianity, which Europeans considered uniquely posed to civilize the world.
The modern meaning of the phrase "world religion" began with the 1893 Parliament of the World's Religions in Chicago, Illinois. This event was sharply criticized by European Orientalists up until the 1960s as "unscientific", because it allowed religious leaders to speak for themselves instead of bowing to the superior knowledge of the Western academic. As a result its approach to "world religion" was not taken seriously in the scholarly world for some time. Nevertheless, the Parliament spurred the creation of a dozen privately funded lectures with the intent of informing people of the diversity of religious experience: these lectures funded researchers such as William James, D.T. Suzuki, and Alan Watts.
In the latter half of the 20th century, the category of "world religion" fell into serious question, especially for drawing parallels between vastly different cultures, and thereby creating an arbitrary separation between the religious and the secular. Even history professors have now taken note of these complications and advise against teaching "world religions" in schools.
Abrahamic religions are by far the largest group, and these consist mainly of Christianity, Islam and Judaism (sometimes the Bahá'í Faith is also included). They are named for the patriarch Abraham, and are unified by the practice of monotheism. Today, around 3.4 billion people are followers of Abrahamic religions and are spread widely around the world apart from the regions around South-East Asia. Several Abrahamic organizations are vigorous proselytizers.
East Asian religions consist of several East Asian religions which make use of the concept of Tao (in Chinese) or Do (in Japanese or Korean), namely Taoism and Confucianism, both of which are asserted by some scholars to be non-religious in nature.
One way to define a major religion is by the number of current adherents. The population numbers by religion are computed by a combination of census reports and population surveys (in countries where religion data is not collected in census, for example USA or France), but results can vary widely depending on the way questions are phrased, the definitions of religion used and the bias of the agencies or organizations conducting the survey. Informal or unorganized religions are especially difficult to count.
There is no consensus among researchers as to the best methodology for determining the religiosity profile of the world's population. A number of fundamental aspects are unresolved:
Whether to count "historically predominant religious culture[s]"
Whether to count only those who actively "practice" a particular religion
Whether to count based on a concept of "adherence"
Whether to count only those who expressly self-identify with a particular denomination
Whether to count only adults, or to include children as well.
Whether to rely only on official government-provided statistics
Whether to use multiple sources and ranges or single "best source(s)"
Largest religions or belief systems by number of adherents
The table below lists religions classified by philosophy; however, religious philosophy is not always the determining factor in local practice. Please note that this table includes heterodox movements as adherents to their larger philosophical category, although this may be disputed by others within that category. For example, Cao Đài is listed because it claims to be a separate category from Buddhism, while Hoa Hao is not, even though they are similar new religious movements.
The population numbers below are computed by a combination of census reports, random surveys (in countries where religion data is not collected in census, for example USA or France), and self-reported attendance numbers, but results can vary widely depending on the way questions are phrased, the definitions of religion used and the bias of the agencies or organizations conducting the survey. Informal or unorganized religions are especially difficult to count. Some organizations may wildly inflate their numbers.
This section may contain inappropriate or misinterpreted citations that do not verify the text. Please help improve this article by checking for inaccuracies. (help, talk, get involved!) (July 2009)
Since the late 19th century, the demographics of religion have changed a great deal. Some countries with a historically large Christian population have experienced a significant decline in the numbers of professed active Christians: see demographics of atheism. Symptoms of the decline in active participation in Christian religious life include declining recruitment for the priesthood and monastic life, as well as diminishing attendance at church. On the other hand, since the 19th century, large areas of sub-saharan Africa have been converted to Christianity, and this area of the world has the highest population growth rate. In the realm of Western civilization, there has been an increase in the number of people who identify themselves as secular humanists. In many countries, such as the People's Republic of China, communist governments have discouraged religion, making it difficult to count the actual number of believers. However, after the collapse of communism in numerous countries of Eastern Europe and the former Soviet Union, religious life has been experiencing resurgence there, both in the form of traditional Eastern Christianity and particularly in the forms of Neopaganism and Far Eastern religions.
Studies conducted by the Pew Research Center have found that, generally, poorer nations had a larger proportion of citizens who found religion to be very important than richer nations, with the exceptions of the United States and Kuwait.
Maps of self-reported adherence
Map showing relative degree of religiosity by country. Based on a 2006-2008 worldwide survey by Gallup.
World map showing the percentages of people who regard religion as "non-important" according to a 2002 Pew survey
Religions of the world, mapped by distribution.
Predominant religions of the world, mapped by state
^ Stephen R. L. Clark. "World Religions and World Orders". Religious Studies 26.1 (1990).
^ Joel E. Tishken. "Ethnic vs. Evangelical Religions: Beyond Teaching the World Religion Approach". The History Teacher 33.3 (2000).
^Brodd, Jefferey (2003). World Religions. Winona, MN: Saint Mary's Press. ISBN978-0-88489-725-5.
^Pippa Norris, Ronald Inglehart (2007-01-06), [www.cambridge.org/9780521839846 Sacred and Secular, Religion and Politics Worldwide], Cambridge University Press, p. 43-44, www.cambridge.org/9780521839846, retrieved 2006-12-29
^Pew Research Center (2002-12-19). "Among Wealthy Nations U.S. Stands Alone in its Embrace of Religion". Pew Research Center. http://pewglobal.org/reports/display.php?ReportID=167. Retrieved 2006-10-12.
^adherents.com (2005-08-28). "Major Religions of the World Ranked by Number of Adherents". adherents.com. http://www.adherents.com/Religions_By_Adherents.html. Retrieved 2006-10-12.
^"Mapping the Global Muslim Population". http://pewforum.org/docs/?DocID=450. Retrieved 2009-10-08.
^"World distribution of muslim population". Pew Centre. October 2009. http://pewresearch.org/assets/pewforum-muslim-project/weighted-map.htm. Retrieved 26 December 2009.
^ Fischer-Schreiber, Ingrid, et al. The Encyclopedia of Eastern Philosophy & Religion: Buddhism, Hinduism, Taoism, Zen. Shambhala: Boston (English: pub. 1994; orig. German: 1986); pg. 50.
^ While almost the entire population of Japan attends Shinto shrines on festival days, it is nearly impossible to say how many consider themselves "Shinto believers".
^ Indian Registrar General & Census Commissioner. "Religious Composition". Census of India, 2001
^World Almanac and Book of Facts 2000. Mahwah, NJ: PRIMEDIA Reference Inc. (1999).
^"World Religions (2005)". QuickLists > The World > Religions. The Association of Religion Data Archives. 2005. http://www.thearda.com/QuickLists/QuickList_125.asp. Retrieved 2009-07-04.
^ Historically, the Bahá'í Faith arose in 19th century Persia, in the context of Shi'a Islam, and thus may be classed on this basis as a divergent strand of Islam, placing it in the Abrahamic tradition. However, the Bahá'í Faith considers itself an independent religious tradition, which draws from Islam but also other traditions. The Bahá'í Faith may also be classed as a new religious movement, due to its comparatively recent origin, or may be considered sufficiently old and established for such classification to not be applicable.
^Encyclopædia Britannica (2002). "Worldwide Adherents of All Religions by Six Continental Areas, Mid-2002". Encyclopædia Britannica. Encyclopædia Britannica.
^MacEoin, Denis (2000). "Baha'i Faith". in Hinnells, John R.. The New Penguin Handbook of Living Religions: Second Edition. Penguin. ISBN0140514805.
^"Most Baha'i Nations (2005)". QuickLists > Compare Nations > Religions >. The Association of Religion Data Archives. 2005. http://www.thearda.com/QuickLists/QuickList_40.asp. Retrieved 2009-07-04.
^ Figures for the population of Jains differ from just over six million to twelve million due to difficulties of Jain identity, with Jains in some areas counted as a Hindu sect. Many Jains do not return Jainism as their religion on census forms for various reasons such as certain Jain castes considering themselves both Hindu and Jain. Following a major advertising campaign urging Jains to register as such, the 1981 Census of India returned 3.19 million Jains. This was estimated at the time to still be half the true number. The 2001 Census of India had 8.4 million Jains.
^ Self-reported figures from 1999; North Korea only (South Korean followers are minimal according to self-reported figures). In The A to Z of New Religious Movements by George D. Chryssides. ISBN 0810855887
^ ab Self-reported figures printed in Japanese Ministry of Education's Shuukyou Nenkan, 2003
^ Sergei Blagov. "Caodaism in Vietnam : Religion vs Restrictions and Persecution". IARF World Congress, Vancouver, Canada, July 31st, 1999.
^ Encyclopedia of the Modern Middle East and North Africa (Detroit: Thompson Gale, 2004) p. 82
^ International Committee for European Security & Cooperation: statement presented by J.B.Daud Baghistani, ICESC Deputy Permanent Representative to the Commission on Human Rights... 10 Feb. 1995
^ Leonard E. Barrett. The Rastafarians: Sounds of Cultural Dissonance. Beacon Press, 1988. p. viii.
^ abc The number of people who consider themselves party to a "folk tradition" is impossible to determine.
^ The results have been studied and found "highly correlated with other sources of data," but "consistently gave a higher estimate for percent Christian in comparison to other cross-national data sets." Hsu, Becky; Reynolds, Amy; Hackett, Conrad; Gibbon, James (2008-07-09), "Estimating the Religious Composition of All Nations" (pdf), Journal for the Scientific Study of Religion, http://www.princeton.edu/~bhsu/Hsu2008.pdf
^International Community, Bahá'í (1992), "How many Bahá'ís are there?", The Bahá'ís: 14, http://www.bahai.com/thebahais/pg14.htm.
^Barrett, David A. (2001). World Christian Encyclopedia. pp. 4. http://www.bible.ca/global-religion-statistics-world-christian-encyclopedia.htm.
^Barrett, David; Johnson, Todd (2001). "Global adherents of the World's 19 distinct major religions". William Carey Library. http://web.archive.org/web/20080228224811/http://www.gordonconwell.edu/ockenga/globalchristianity/gd/wct-1-2.pdf. Retrieved 2006-10-12.
^Pew Research Center (2002-12-19). "Among Wealthy Nations U.S. Stands Alone in its Embrace of Religion". Pew Research Center. http://pewglobal.org/reports/display.php?ReportID=167. Retrieved 2006-10-12.
^Pew Research Center (2008-01-01). "Income and Religiosity". http://benmuse.typepad.com/ben_muse/2008/01/wealth-and-reli.html. Retrieved 2009-09-14.
External links
Animated history of World Religions - from the "Religion & Ethics" part of the BBC website, interactive animated view of the spread of world religions (requires Flash plug-in).