| Country | Religions |
| Iraq | Muslim 97% (Shia 60%-65%, Sunni 32%-37%), Christian or other 3% |
| 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 | Anglican, Roman Catholic, Methodist, Baptist, Presbyterian, Society of Friends |
| Israel | Jewish 76.4%, Muslim 16%, Arab Christians 1.7%, other Christian 0.4%, Druze 1.6%, unspecified 3.9% (2004) |
| 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 | Anglican, Roman Catholic, Baptist, Congregational New Church, Methodist, Presbyterian |
| Jordan | Sunni Muslim 92%, Christian 6% (majority Greek Orthodox, but some Greek and Roman Catholics, Syrian Orthodox, Coptic Orthodox, Armenian Orthodox, and Protestant denominations), other 2% (several small Shia Muslim and Druze populations) (2001 est.) |
| Kazakhstan | Muslim 47%, Russian Orthodox 44%, Protestant 2%, other 7% |
| Kenya | Protestant 45%, Roman Catholic 33%, Muslim 10%, indigenous beliefs 10%, other 2% note: a large majority of Kenyans are Christian, but estimates for the percentage of the population that adheres to Islam or indigenous beliefs vary widely |
| Kiribati | Roman Catholic 52%, Protestant (Congregational) 40%, other (includes Seventh-Day Adventist, Muslim, Baha'i, Latter-day Saints, Church of God) 8% (1999) |
| Korea, North | traditionally Buddhist and Confucianist, some Christian and syncretic Chondogyo (Religion of the Heavenly Way) note: autonomous religious activities now almost nonexistent; government-sponsored religious groups exist to provide illusion of religious freedom |
| Korea, South | Christian 26.3% (Protestant 19.7%, Roman Catholic 6.6%), Buddhist 23.2%, other or unknown 1.3%, none 49.3% (1995 census) |
| Kosovo | Muslim, Serbian Orthodox, Roman Catholic |
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This page was last updated on 28 June, 2009 |
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