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|"αθεοι" (atheoi), Greek for "those without god", as it appears in the Epistle to the Ephesians on the third-century papyrus known as "Papyrus 46"|
Irreligion (adjective form: non-religious or irreligious) is the absence of religion, an indifference towards religion, a rejection of religion, or hostility towards religion. When characterized as the rejection of religious belief, it includes explicit atheism, religious dissidence, and secular humanism. When characterized as hostility towards religion, it includes anticlericalism, antireligion, and antitheism.
When characterized as indifference to religion, it includes apatheism. When characterized as the absence of religious belief, it may also include deism, implicit atheism, spiritual but not religious, agnosticism, pandeism, ignosticism, nontheism, pantheism, panentheism, religious skepticism, and freethought. Irreligion may include forms of theism, depending on the religious context it is defined against. In 18th-century Europe, the epitome of irreligion was deism.
A 2012 survey found that 36% of the world population is not religious and that between 2005 and 2012 world religiosity decreased by 9 percentage points. Being nonreligious is not necessarily equivalent to being an atheist or agnostic. A Pew Research Center global report in 2012 noted that many of the nonreligious actually have some religious beliefs. According to the study, "belief in God or a higher power is shared by 7% of Chinese unaffiliated adults, 30% of French unaffiliated adults and 68% of unaffiliated U.S. adults." The majority of the nonreligious (76%) are concentrated in Asia and the Pacific, while only a small portion comes from Europe (12%) or North America (5%).
A noted exception to ambiguity, explicitly allowing non-religion, is Article 36 of the Constitution of the People's Republic of China (as authored in 1982), which states that "No state organ, public organization or individual may compel citizens to believe in, or not to believe in, any religion; nor may they discriminate against citizens who believe in, or do not believe in, any religion." Article 46 of China’s 1978 Constitution was even more explicit, stating that "Citizens enjoy freedom to believe in religion and freedom not to believe in religion and to propagate atheism."
Although 10 countries listed below have non-religious majorities, it does not mean that majority of the populations of these countries don′t belong to any religious group. For example, 67.5% of the Swedish population belongs to Lutheran Christian Church, while 58.7% of Albanians declare themselves as Muslims. Also, though Scandinavian countries have among the highest measures of nonreligiosity and even atheism in Europe, 47% of atheists who live in those countries are still members of the national churches.
A Pew 2015 global projection study for religion and nonreligion, projects that between 2010 and 2050, there will some initial increases of the unaffiliated followed by a decline by 2050 due to lower global fertility rates among this demographic.  Sociologist Phil Zuckerman's global studies on atheism have indicated that global atheism may be in decline due to irreligious countries having the lowest birth rates in the world and religious countries having higher birth rates in general.
The tables below order the percentage of a country's population that are nonreligious from highest to lowest.
- Importance of religion by country
- Irreligion by country
- Nontheistic religions
- Spiritual but not religious
- "Irreligion as presented in 26 reference works".
- "Definition including hostility and indifference", Compact Oxford Dictionary
- "Definition including lack and indifference", Collins Dictionary
- "Irreligion", Encyclopedia of Religion and Society, retrieved 2012-02-18 Includes rejection.
- Colin Campbell, "Irreligion", Encyclopedia of Religion and Society, retrieved 2012-02-18
- Campbell, Colin. 1971. Towards a Sociology of Irreligion. London:McMillan p. 31.
- "Global Index of Religiosity and Atheism" (PDF). WIN-Gallup International. 27 July 2012. Retrieved 2012-08-24.
- "The Global Religious Landscape - Religiously Unaffiliated". Pew Research Center. December 18, 2012.
- People's Republic of China 1978 Constitution (PDF). 1978. p. 41. Retrieved 2014-02-02.
- "Kyrkan i siffror, Swedish Lutheran Christian Church in numbers".
- Zuckerman, Phil, ed. (2010). "Ch. 9 Atheism And Secularity: The Scandinavian Paradox". Atheism and Secularity Vol.2. Praeger. ISBN 0313351813.
- "The Future of World Religions: Population Growth Projections, 2010-2050". Pew Research Center. April 5, 2012.
- Zuckerman, Phil (2007). Martin, Michael, ed. The Cambridge Companion to Atheism. Cambridge Univ. Press. p. 59. ISBN 0521603676.
- The Religiosity Index is a measure of the importance of religion for respondents and their self-reported attendance of religious services. For religions in which attendance at services is limited, care must be used in interpreting the data. (Gallup WorldView)[dead link]
- "Population by religious belief and by municipality size groups" (PDF). Czech Statistical Office. Retrieved 23 April 2012.
- Zuckerman, Phil. "Atheism: Contemporary Rates and Patterns", from the Cambridge Companion to Atheism, edited by Michael Martin, University of Cambridge Press, 2007
- Dentsu Communication Institute Inc., Research Centre for Japan (2006)Invalid language code.
- Knippenberg, Hans "The Changing Religious Landscape of Europe" edited by Knippenberg published by Het Spinhuis, Amsterdam 2005 ISBN 90-5589-248-3, page 92
- "Albania". State.gov. 2006-09-15. Retrieved 2011-02-04. US Department of State - International religious freedom report 2006
- L'Albanie en 2005
- "Adherents.com". Adherents.com. Retrieved 2011-02-04. Some publications
- UK National Statistics Bureau (2011 census)
- "Global Index Of Religion and Atheism" (PDF). Redcresearch.ie. Retrieved 2011-11-01. Publications are taken from Gallup
- "Adherents.com". Adherents.com. Retrieved 2011-02-04. Some publications
- According to figures compiled by the South Korean National Statistical Office. "인구,가구/시도별 종교인구/시도별 종교인구 (2005년 인구총조사)". NSO online KOSIS database. Retrieved August 23, 2006.
- "fowid - Forschungsgruppe Weltanschauungen in Deutschland: Home". Fowid.de. Retrieved 2011-09-12. German Worldview Research Group (2010)
- Cary Funk, Greg Smith. "Nones" on the Rise: One-in-Five Adults Have No Religious Affiliation" (PDF). Pew Research Center. p. 43.
Nearly one-in-five say they are spiritual but not religious (18%), and about one-in-six say they are neither religious nor spiritual (15%).
- "96F0030XIE2001015 - Religions in Canada". 2.statcan.ca. Retrieved 2013-05-08. Canada 2011 census
-  Socialogical Research Centre, January 2012
- "Census shows result of mining boom, with increased cost of housing and higher wages", PIA AKERMAN, The Australian, 21 June 2012.
- "Ständige Wohnbevölkerung ab 15 Jahren nach Religions- / Konfessionszugehörigkeit, 2012" (XLS). http://www.bfs.admin.ch (Statistics) (in German, French, and or Italian). Neuchâtel: Swiss Federal Statistical Office. 2012. Retrieved 2014-04-05.
- "Table Of Statistics On Religion In The Americas". Prolades.com. April 2001. Retrieved 2011-02-04. Gallup-Argentina survey
- [dead link] Güney Afrika 2001 census
- "Census 2010; Sistema IBGE de Recuperação Automática SIDRA". Retrieved 2013-06-29.
- "This is Ireland. Highlights from Census 2011, Part 1" (PDF). March 2012. Retrieved 2013-06-29.
- "Secular Sunday #14 – Census Special". April 2012.
- ประชากรจำแนกตามศาสนา หมวดอายุ เพศ และเขตการปกครอง (in ไทย). สำมะโนประชากรและเคหะ พ.ศ. 2543 (2000 census), National Statistical Office of Thailand. Retrieved 2013-10-26.
|40x40px||Wikimedia Commons has media related to Irreligion.|
- John Allen Paulos (9 June 2009). Irreligion: A Mathematician Explains Why the Arguments for God Just Don't Add Up. Macmillan. ISBN 978-0-8090-5918-8.
- Richard Henry Popkin; Arie Johan Vanderjagt (1993). Scepticism and irreligion in the seventeenth and eighteenth centuries. BRILL. ISBN 978-90-04-09596-0.
- Eric Wright (November 2010). Irreligion: Thought, Rationale, History. BiblioBazaar. ISBN 978-1-171-06863-1.
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