| Country | Religions |
| Hungary | Roman Catholic 51.9%, Calvinist 15.9%, Lutheran 3%, Greek Catholic 2.6%, other Christian 1%, other or unspecified 11.1%, unaffiliated 14.5% (2001 census) |
| Iceland | Lutheran Church of Iceland (official) 80.7%, Roman Catholic 2.5%, Reykjavik Free Church 2.4%, Hafnarfjorour Free Church 1.6%, other religions 3.6%, unaffiliated 3%, other or unspecified 6.2% (2006 est.) |
| India | Hindu 80.5%, Muslim 13.4%, Christian 2.3%, Sikh 1.9%, other 1.8%, unspecified 0.1% (2001 census) |
| Indian Ocean | void |
| Indonesia | Muslim 86.1%, Protestant 5.7%, Roman Catholic 3%, Hindu 1.8%, other or unspecified 3.4% (2000 census) |
| Iran | Muslim (official) 98% (Shia 89%, Sunni 9%), other (includes Zoroastrian, Jewish, Christian, and Baha'i) 2% |
| Iraq | Muslim (official) 97% (Shia 60%-65%, Sunni 32%-37%), Christian or other 3%
note: while there has been voluntary relocation of many Christian families to northern Iraq, recent reporting indicates that the overall Christian population may have dropped by as much as 50 percent since the fall of the Saddam HUSSEIN regime in 2003, with many fleeing to Syria, Jordan, and Lebanon |
| Ireland | Roman Catholic 87.4%, Church of Ireland 2.9%, other Christian 1.9%, other 2.1%, unspecified 1.5%, none 4.2% (2006 census) |
| Isle of Man | Protestant (Anglican, Methodist, Baptist, Presbyterian, Society of Friends), Roman Catholic |
| Israel | Jewish 75.6%, Muslim 16.9%, Christian 2%, Druze 1.7%, other 3.8% (2008 census) |
| Italy | Roman Catholic 90% (approximately; about one-third practicing), other 10% (includes mature Protestant and Jewish communities and a growing Muslim immigrant community) |
| Jamaica | Protestant 62.5% (Seventh-Day Adventist 10.8%, Pentecostal 9.5%, Other Church of God 8.3%, Baptist 7.2%, New Testament Church of God 6.3%, Church of God in Jamaica 4.8%, Church of God of Prophecy 4.3%, Anglican 3.6%, other Christian 7.7%), Roman Catholic 2.6%, other or unspecified 14.2%, none 20.9%, (2001 census) |
| Jan Mayen | void |
| Japan | Shintoism 83.9%, Buddhism 71.4%, Christianity 2%, other 7.8%
note: total adherents exceeds 100% because many people belong to both Shintoism and Buddhism (2005) |
| Jersey | Protestant (Anglican, Baptist, Congregational New Church, Methodist, Presbyterian), Roman Catholic |
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This page was last updated on 3 February, 2012 |
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