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( January 2017 ) This is a list of religious populations by number of adherents and countries. Contents 1 Adherent estimates in 2012 1.1 Notes 2 By proportion 2.1 Christians 2.2 Muslims 2.3 Irreligious and atheist 2.4 Hindus 2.5 Buddhists 2.6 Taoists / Confucianists / Chinese traditional religionists 2.7 Ethnic / Indigenous 2.8 Sikhism 2.9 Judaism 2.10 Spiritism 2.11 Bahá'ís 2.12 Jainism 3 By population 3.1 Christians 3.2 Muslims 3.3 Buddhists 3.4 Hindus 3.5 Jews 3.6 Sikhs 3.7 Bahá'ís 3.8 Jainism 4 See also 5 References 6 External links Adherent estimates in 2012 Size of Major Religious Groups, 2012 Religion Percent Christianity 31.5 % Islam 23.2 % Unaffiliated 16.3 % Hinduism 15.0 % Buddhism 7.1 % Folk 5.9 % Other 0.8 % Judaism 0.2 % Pew Research Center, 2012 Adherents.com says `` Sizes shown are approximate estimates, and are here mainly for the purpose of ordering the groups, not providing a definitive number ''. Religion Adherents Percentage Christianity 7009220000000000000 ♠ 2.2 billion 6999315000000000000 ♠ 31.50 % Islam 7009160000000000000 ♠ 1.6 billion 6999223200000000000 ♠ 22.32 % Secular / Nonreligious / Agnostic / Atheist 7009110000000000000 ♠ ≤ 1.1 billion 6999153500000000000 ♠ 15.35 % Hinduism 7009100000000000000 ♠ 1 billion 6999139499999999999 ♠ 13.95 % Chinese traditional religion 7008394000000000000 ♠ 394 million 6998550000000000000 ♠ 5.50 % Buddhism 7008376000000000000 ♠ 376 million 6998525000000000000 ♠ 5.25 % Ethnic religions excluding some in separate categories 7008300000000000000 ♠ 300 million 6998419000000000000 ♠ 4.19 % African traditional religions 7008100000000000000 ♠ 100 million 6998139999999999999 ♠ 1.40 % Sikhism 7007300000000000000 ♠ 30 million 6997320000000000000 ♠ 0.32 % Spiritism 7007150000000000000 ♠ 15 million 6997210000000000000 ♠ 0.21 % Judaism 7007140000000000000 ♠ 14 million 6997200000000000000 ♠ 0.20 % Bahá'í 7006700000000000000 ♠ 7.0 million 6997100000000000000 ♠ 0.10 % Jainism 7006420000000000000 ♠ 4.2 million 6996600000000000000 ♠ 0.06 % Shinto 7006400000000000000 ♠ 4.0 million 6996600000000000000 ♠ 0.06 % Cao Dai 7006400000000000000 ♠ 4.0 million 6996600000000000000 ♠ 0.06 % Zoroastrianism 7006260000000000000 ♠ 2.6 million 6996400000000000000 ♠ 0.04 % Tenrikyo 7006200000000000000 ♠ 2.0 million 6996200000000000000 ♠ 0.02 % Neo-Paganism 7006100000000000000 ♠ 1.0 million 6996100000000000000 ♠ 0.01 % Unitarian Universalism 7005800000000000000 ♠ 0.8 million 6996100000000000000 ♠ 0.01 % Rastafari 7005600000000000000 ♠ 0.6 million 6996100000000000000 ♠ 0.01 % total 7009716700000000000 ♠ 7167 million 7000100000000000000 ♠ 100 % Notes Jump up ^ These figures may incorporate populations of secular / nominal adherents as well as syncretist worshipers, although the concept of syncretism is disputed by some. Jump up ^ Nonreligious includes agnostic, atheist, secular humanist, and people answering ' none ' or no religious preference. Half of this group is theistic but nonreligious. According to a 2012 study by Gallup International `` 59 % of the world said that they think of themselves as religious person, 23 % think of themselves as not religious whereas 13 % think of themselves as convinced atheists ''. Jump up ^ Chinese traditional religion is described as `` the common religion of the majority Chinese culture : a combination of Confucianism, Buddhism, and Taoism, as well as the traditional non-scriptural / local practices and beliefs. '' By proportion Christians Countries with the greatest proportion of Christians from Christianity by country ( as of 2010 ) : Christian population by country, June 2014. Vatican City 100 % ( 100 % Roman Catholic ) Pitcairn Islands 100 % ( 100 % Seventh - day Adventist ) Samoa ~ 99 % ( mostly Protestant ) Romania 99 % ( mostly Romanian Orthodox ) American Samoa 98.3 % ( mostly Protestant ) Malta 98.1 % ( mostly Roman Catholic ) Venezuela 98 % ( 71 % Roman Catholic ) Greece 98 % ( 95 % Greek Orthodox ) Marshall Islands 97.2 % ( mostly Protestant ) Tonga 97.2 % ( mostly Protestant ) San Marino 97 % ( ~ 97 % Roman Catholic ) Paraguay 96.9 % ( mostly Roman Catholic ) Peru 96.5 % ( mostly Roman Catholic ) El Salvador 96.4 % ( mostly Roman Catholic ) Kiribati 96 % ( mostly Protestant ) Federated States of Micronesia ~ 96 % ( mostly Protestant ) Barbados 95.1 % ( mostly Protestant ) Papua New Guinea 94.8 % ( mostly Protestant ) East Timor 94.2 % ( mostly Roman Catholic ) Armenia 93.5 % ( mostly Armenian Orthodox ) Muslims See also : Muslim World Countries with the greatest proportion of Muslims from Islam by country ( as of 2010 ) ( figures excluding foreign workers in parenthesis ) : Muslim population by country, 2014. Maldives 100 % ( mostly Sunni ) Mauritania 100 % ( mostly Sunni ) Saudi Arabia Reported to be 100 % ( 90 -- 95 % Sunni, 5 -- 10 % Shi'a ) Turkey 99.8 % ( 75 % Sunni, 25 % Shi'a ) Somalia 99.8 % ( mostly Sunni ) Afghanistan ~ 99 % ( mostly Sunni, 20 % Shi'a ) Yemen 99.1 % ( 99.9 % ) ( 53 % Sunni, 47 % Shi'a ) Morocco 98.7 % ( mostly Sunni ) Algeria 98.3 % ( mostly Sunni ) Iran 98 % ( mostly Shi'a ) Tunisia 98 % ( mostly Sunni ) Comoros 98 % ( mostly Sunni ) Sudan 97 % ( mostly Sunni ) Libya 96.6 % ( 99 % ) ( Sunni ) Pakistan 96.4 % ( 75 % Sunni, 25 % Shi'a ) Iraq 95 % ( Mostly Shi'a ) Kuwait 95 % ( Mostly Sunni ) Djibouti 94 % ( mostly Sunni ) Niger 93 % ( mostly Sunni ) Azerbaijan 91.6 ( mostly Shi'a ) Bangladesh 89.4 % ( Sunni ) Egypt 89.3 % ( Sunni ) Indonesia 87.18 % ( 99 % Sunni ) Bahrain 79 % ( Mostly Shi'a ) Remarks : Saudi Arabia does not include other religious beliefs in their census, the figures for these other religious groups could be higher than reported in the nation. While conversion to Islam is among its most supported tenets, conversion from Islam to another religion is considered to be the sin of apostasy and could be subject to the penalty of death in the country. Irreligious and atheist See also : Irreligion by country Nonreligious population by country, 2006. Countries with the greatest proportion of people without religion ( including agnostics and atheists ) from Irreligion by country ( as of 2007 ) : Czech Republic 70 - 81 % ( 78 % ) Estonia 71 -- 82 % ( 76 % ) Japan 64 -- 88 % ( 76 % ) Denmark 72 % Sweden 46 -- 82 % ( 64 % ) Vietnam 44 -- 81 % ( 63 % ) Macau 62 % Hong Kong 57 % France 43 -- 64 % ( 54 % ) Norway 31 -- 72 % ( 52 % ) China 47 % ( details ) Netherlands 39 -- 55 % ( 47 % ) Finland 28 -- 60 % ( 44 % ) New Zealand 42 % United Kingdom 31 -- 52 % ( 42 % ) England and Wales 25 % South Korea 30 -- 52 % ( 41 % ) Germany 25 -- 55 % ( 40 % ) Hungary 32 -- 46 % ( 39 % ) Belgium 42 -- 43 % ( 39 % ) Bulgaria 34 -- 40 % ( 37 % ) Slovenia 35 -- 38 % ( 37 % ) Russia 13 -- 48 % ( 31 % ) Remarks : Ranked by mean estimate which is in brackets. Irreligious includes agnostic, atheist, secular believer, and people having no formal religious adherence. It does not necessarily mean that members of this group don ′ t belong to any religion. Some religions have harmonized with local cultures and can be seen as a cultural background rather than a formal religion. Additionally, the practice of officially associating a family or household with a religious institute while not formally practicing the affiliated religion is common in many countries. Thus, over half of this group is theistic and / or influenced by religious principles, but nonreligious / non-practicing and not true atheists or agnostics. See Spiritual but not religious. Hindus Countries with the greatest proportion of Hindus from Hinduism by country ( as of 2010 ) : Hindu population by country, 2013. Nepal 81.3 % India 79.8 % Mauritius 54 % Fiji 33.7 % Guyana 28 % Bhutan 25 % Suriname 22.3 % Trinidad and Tobago 18.2 % United Arab Emirates 15 % Sri Lanka 12.6 % Kuwait 12 % Bangladesh 9.6 % Bahrain 8.1 % Réunion 6.7 % Malaysia 6.3 % Singapore 5.1 % Oman 3 % Seychelles 2.1 % New Zealand 2.0 % Pakistan 1.8 % Indonesia 1.7 % USA 0.7 % Buddhists Countries with the greatest proportion of Buddhists from Buddhism by country ( as of 2010 ) : Buddhist population by country, 2010. Cambodia 96.9 % Thailand 93.2 % Myanmar 80.1 % Bhutan 74.70 % Sri Lanka 69.3 % Laos 66.0 % Mongolia 55.1 % Japan 36.2 % Taiwan 35.1 % Singapore 33.2 % South Korea 22.9 % Malaysia 19.8 % China 18.2 % Macau 17.3 % Vietnam 16.4 % Hong Kong 13.2 % Nepal 10.3 % Taoists / confucianists / Chinese traditional religionists As a spiritual practice, Taoism has made fewer inroads in the West than Buddhism and Hinduism. Despite the popularity of its great classics the I Ching and the Tao Te Ching, the specific practices of Taoism have not been promulgated in America with much success ; these religions are not ubiquitous worldwide in the way that adherents of bigger world religions are, and they remain primarily an ethnic religion. Nonetheless, Taoist ideas and symbols such as Taijitu have become popular throughout the world through Tai Chi Chuan, Qigong, and various martial arts. Taiwan 33 -- 80 % China 30 % Hong Kong 28 % Macau 13.9 % Singapore 8.5 % Malaysia 2.6 % South Korea 0.2 -- 1 % Vietnam Philippines 0.01 -- 0.05 % Indonesia 0.05 % The Chinese traditional religion has 184,000 believers in Latin America, 250,000 believers in Europe, and 839,000 believers in North America as of 1998. Ethnic / indigenous All of the below come from the U.S Department of State 2009 International Religious Freedom Report, based on the highest estimate of people identified as indigenous or followers of indigenous religions that have been well - defined. Due to the syncretic nature of these religions, the following numbers may not reflect the actual number of practitioners. Haiti 50 % Guinea - Bissau 50 % Cameroon 40 % Togo 33 % Côte d'Ivoire 25 % Sudan 25 % Benin 23 % Burundi 20 % Burkina Faso 15 % New Zealand 15 % South Africa 15 % Democratic Republic of the Congo 12 % Central African Republic 10 % Gabon 10 % Lesotho 10 % Nigeria 10 % Sierra Leone 10 % Indonesia 9 % Kenya 9 % Palau 9 % Ghana 8.5 % Guinea 5 % Sikhism Countries with the greatest proportion of Sikhs : India 1.9 % United Kingdom 1.2 % Canada 0.9 % Malaysia 0.5 % Fiji 0.3 % Singapore 0.3 % United States 0.2 % New Zealand 0.2 % Australia 0.1 % Italy 0.1 % The Sikh homeland is the Punjab state, in India, where today Sikhs make up approximately 61 % of the population. This is the only place where Sikhs are in the majority. Sikhs have emigrated to countries all over the world -- especially to English - speaking and East Asian nations. In doing so they have retained, to an unusually high degree, their distinctive cultural and religious identity. Sikhs are not ubiquitous worldwide in the way that adherents of larger world religions are, and they remain primarily an ethnic religion. But they can be found in many international cities and have become an especially strong religious presence in the United Kingdom and Canada. Judaism Jewish population by country, 2010. Countries with the greatest proportion of Jews ( as of 2010 ) : Israel 75.4 % Palestine ( West Bank only ) 12 -- 14 % Monaco 2.9 % United States 2.1 % Gibraltar 2.1 % Cayman Islands 1.7 % Netherlands Antilles ^ 1.3 % Canada 1.1 % France 0.8 % Argentina 0.6 % Uruguay 0.5 % Australia 0.5 % Hungary 0.5 % U.S. Virgin Islands 0.5 % Latvia 0.3 % Germany 0.25 % Netherlands 0.2 % New Zealand 0.2 % Ukraine 0.2 % Russia 0.09 % Spiritism Cuba 10.3 % Jamaica 10.2 % Brazil 4.8 % Suriname 3.6 % Haiti 2.7 % Dominican Republic 2.2 % The Bahamas 1.9 % Nicaragua 1.5 % Trinidad and Tobago 1.4 % Guyana 1.3 % Venezuela 1.1 % Colombia 1.0 % Belize 1.0 % Honduras 0.9 % Puerto Rico 0.7 % Panama 0.5 % Iceland 0.5 % Guadeloupe 0.4 % Argentina 0.2 % Guatemala 0.2 % Source : http://www.thearda.com/QuickLists/QuickList_50.asp Note that all these estimates come from a single source. However, this source gives a relative indication of the size of the Spiritist communities within each country. Bahá'ís Main article : Bahá'í statistics Countries with the greatest proportion of Bahá'ís ( as of 2010 ) with a national population ≥ 200,000 : Belize 2.5 % ( The 2010 Belize Population Census recorded 202 Bahá'ís out of a total population of 304,106, yielding a proportion of 0.066 % ) Bolivia 2.2 % Zambia 1.8 % Mauritius 1.8 % ( The 2011 Mauritius census recorded 639 Bahá'ís out of a total population of 1,236,817 yielding a proportion of 0.05 % ) Guyana 1.6 % ( The 2002 Guyana census recorded 500 Bahá'ís out of a total population of 751,223 yielding a proportion of 0.067 % ) Vanuatu 1.4 % Barbados 1.2 % ( The 2010 Barbados census recorded 178 Bahá'ís out of a total population of 250,010 yielding a proportion of 0.07 % ) Trinidad and Tobago 1.2 % Panama 1.2 % Kenya 1.0 % Lesotho 0.9 % Papua New Guinea 0.9 % Réunion 0.9 % Chad 0.9 % Botswana 0.8 % Gambia 0.8 % Suriname 0.8 % Congo, Republic of the 0.6 % Solomon Islands 0.6 % Venezuela 0.6 % Remarks & Sources : `` Most Baha'i Nations ( 2010 ) ''. QuickLists > Compare Nations > Religions. The Association of Religion Data Archives. 2010. Retrieved 2013 - 08 - 20. which used the `` World Christian Database '' for adherents estimates based on information provided by the World Christian Encyclopedia and `` World Christian Trends ''. A source whose only systematic flaw was to consistently have a higher estimate of Christians than other cross-national data sets. See `` The Largest Baha'i Communities ''. Largest Religious Communities. Adherents.com. 2013. Retrieved 2013 - 08 - 20. for 2000 estimates among all nations. Various census figures of some of these countries vary significantly. See Bahá'í statistics. Jainism This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. ( August 2014 ) India 0.3 % Suriname 0.3 % Fiji 0.2 % Kenya 0.2 % By Population Christians Largest Christian populations ( as of 2011 ) : United States 229,157,250 ( details ) Brazil 169,213,130 Russia 114,198,444 Mexico 106,204,560 Nigeria 80,510,000 Philippines 78,790,000 China 67,070,000 Democratic Republic of the Congo 63,150,000 France 55,948,600 Italy 55,832,000 Ethiopia 51,477,950 Germany 50,752,580 Colombia 44,502,000 Ukraine 41,973,000 South Africa 40,243,000 Spain 38,568,000 Poland 36,526,000 Kenya 33,625,790 Argentina 33,497,100 United Kingdom 33,200,417 Uganda 29,943,000 India 28,436,000 Venezuela 28,340,790 Peru 27,365,100 Indonesia 24,123,000 Muslims Muslim population by country, 2009. Largest Muslim populations ( as of 2013 ) : Indonesia 206,986,560 Pakistan 180,608,292 India 172,000,000 Bangladesh 132,937,800 Nigeria 80,000,000 Iran 73,238,340 Egypt 70,056,000 Turkey 70,036,838 Algeria 36,092,810 Morocco 31,351,800 Afghanistan 30,112,680 Sudan 30,064,180 Iraq 29,767,300 Ethiopia 28,120,050 Saudi Arabia 26,624,560 Uzbekistan 25,628,240 Yemen 23,836,523 China 20,095,870 Syria 19,601,750 Malaysia 17,085,402 Buddhists Largest Buddhist populations China 244,130,000 Thailand 64,420,000 Japan 45,820,000 Burma 38,410,000 South Korea 10,500,000 Sri Lanka 4,450,000 Vietnam 4,380,000 Cambodia 3,690,000 India 9,250,000 Malaysia 5,010,000 Indonesia 1,710,000 Hindus Largest Hindu populations ( as of 2010 ) : India 957,636,314 Nepal 21,354,570 Bangladesh 14,274,430 Indonesia 4,012,470 Pakistan 2,603,895 Sri Lanka 2,554,606 Malaysia 1,700,100 United States 1,543,730 United Arab Emirates 1,239,610 South Africa 749,870 Mauritius 665,820 United Kingdom 630,000 Canada 497,960 Tanzania 403,570 Kuwait 328,440 Australia 275,500 Singapore 264,370 Fiji 261,097 Trinidad and Tobago 240,100 Myanmar 203,000 Bhutan 177,100 Germany 120,000 Jews Largest Jewish populations ( as of 2011 ) : United States 6,588,065 Israel 5,907,500 France 493,600 Canada 375,000 United Kingdom 291,000 Russia 194,000 Argentina 181,800 Germany 119,000 Australia 97,300 Brazil 95,300 Ukraine 70,200 South Africa 67,000 Hungary 48,200 Mexico 39,200 Belgium 30,000 Italy 28,200 Chile 18,500 Turkey 17,400 Uruguay 17,300 Belarus 12,000 Sikhs Largest Sikh populations India 22,892,600 UK 853,000 Canada 620,200 USA 500,010 Malaysia 120,000 Bangladesh 100,000 Australia 72,300 Italy 70,000 Thailand 70,000 Myanmar 70,000 United Arab Emirates 50,000 Germany 40,000 Mauritius 37,700 Australia 72,300 Pakistan 50,000 Kenya 20,000 Kuwait 20,000 Philippines 20,000 New Zealand 17,400 Indonesia 15,000 Singapore 14,500 Bahá'ís Largest Bahá'í populations ( as of 2010 ) in countries with a national population ≥ 200,000 : India 1,897,651 ( The 2011 Census of India recorded 4,572 Bahá'ís ) United States 512,864 Kenya 422,782 Vietnam 388,802 Congo, Democratic Republic of the 282,916 Philippines 275,069 Iran 251,127 Zambia 241,112 South Africa 238,532 Bolivia 215,359 Tanzania 190,419 Venezuela 169,811 Uganda 95,098 Chad 94,499 Pakistan 87,259 Burma ( Myanmar ) 78,915 Colombia 70,504 Malaysia 67,549 Thailand 65,096 Papua New Guinea 59,898 Jainism As of 2005 : India 5,146,697 United States 79,459 Kenya 68,848 United Kingdom 16,869 Canada 12,101 Tanzania 9,002 Nepal 6,800 Uganda 2,663 Burma 2,398 Malaysia 2,052 South Africa 1,918 Fiji 1,573 Japan 1,535 Australia 1,449 Suriname 1,217 Réunion 981 Belgium 815 Yemen 229 See also Major religious groups Importance of religion by country Religions : Religions by country Bahá'í Faith by country Buddhism by country Christianity by country Roman Catholicism by country Protestantism by country Orthodoxy by country Hinduism by country Islam by country Ahmadiyya by country Judaism by country Sikhism by country References Jump up ^ `` The Global Religious Landscape ''. 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Question: what is most popular religion in the world
Answer: Christianity