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Irreligion may include some forms of theism, depending on the religious context it is defined against; for example, in 18th-century Europe, the epitome of irreligion was deism,  while in contemporary East Asia the shared term meaning "irreligion" or "no religion" (無宗教, Chinese pron. wú zōngjiào, Japanese pron. mu shūkyō), with which the majority of East Asian populations identify themselves, implies non-membership in one of the institutional religions (such as Buddhism and Christianity), and not necessarily non-belief in traditional folk religions collectively represented by Chinese Shendao and Japanese Shinto (both meaning "ways of gods"). 
According to the Pew Research Center's 2012 global study of 230 countries and territories, 16% of the world's population is not affiliated with a religion, while 84% are affiliated.  By 2060, according to their projections, the number of unaffiliated will increase by over 35 million, but the percentage will decrease to 13% because the total population will grow faster.  
According to cross-cultural studies, secularism is expected to decline throughout the 21st century since religion and fertility are positively related, while secularism and fertility are negatively related. 
- Secular humanism embraces human reason, ethics, social justice, and philosophical naturalism while specifically rejecting religious dogma, supernaturalism, pseudoscience, and superstition as the bases of morality and decision making. Secular humanism posits that human beings are capable of being ethical and moral without religion or a god.
- Freethought holds that positions regarding truth should be formed on the basis of logic, reason, and empiricism, rather than authority, tradition, revelation, or other dogma. In particular, freethought is strongly tied with rejection of traditional religious belief.
- " Spiritual but not religious" rejects organized religion as the sole or most valuable means of furthering spiritual growth. In contrast to religion, spirituality has often been associated with the interior life of the individual.
- Theological noncognitivism is the argument that religious language – specifically, words such as "God" – are not cognitively meaningful. It is sometimes considered as synonymous with ignosticism.
- Antireligion is opposition to religion of any kind. It can describe opposition to organized religion, religious practices, religious institutions, or specific forms of supernatural worship or practice, whether organized or not.
In 1993, the UN's human rights committee declared that article 18 of the International Covenant on Civil and Political Rights "protects theistic, non-theistic and atheistic beliefs, as well as the right not to profess any religion or belief."  The committee further stated that "the freedom to have or to adopt a religion or belief necessarily entails the freedom to choose a religion or belief, including the right to replace one's current religion or belief with another or to adopt atheistic views." Signatories to the convention are barred from "the use of threat of physical force or penal sanctions to compel believers or non-believers" to recant their beliefs or convert.  
A noted exception to ambiguity, explicitly allowing non-religion, is Article 36 of the Constitution of the People's Republic of China (as adopted 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." 
A non-denominational person or organization is not restricted to any particular or specific religious denomination. The term has been used in the context of various faiths including Jainism,  Bahá'í Faith,  Zoroastrianism,  Unitarian Universalism,  Paganism,  Christianity,  Islam,  Judaism,  Hinduism,  Buddhism  and Wicca.  It stands in contrast with a religious denomination.
Although 11 countries listed below have non-religious majorities, it does not mean that the majority of the populations of these countries don′t belong to any religious group. For example, 68% of the Swedish population belongs to the Lutheran Christian Church,  while 59% of Albanians declare themselves as Muslims.[ citation needed] 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 be 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. 
According to Pew Research Center's 2012 global study of 230 countries and territories, 16% of the world's population is not affiliated with a religion, while 84% are affiliated.  A 2012 Worldwide Independent Network/Gallup International Association report on a poll from 57 countries reported that 59% of the world's population identified as religious person, 23% as not religious person, 13% as "convinced atheists", and also a 9% decrease in identification as "religious" when compared to the 2005 average from 39 countries.  Their follow-up report, based on a poll in 2015, found that 63% of the globe identified as religious person, 22% as not religious person, and 11% as "convinced atheists".  Their 2017 report found that 62% of the globe identified as religious person, 25% as not religious person, and 9% as "convinced atheists".  However, researchers have advised caution with the WIN/Gallup International figures since other surveys which use the same wording, have conducted many waves for decades, and have a bigger sample size, such as World Values Survey; have consistently reached lower figures for the number of atheists worldwide. 
Being non-religious is not necessarily equivalent to being an atheist or agnostic. Pew Research Center's global study from 2012 noted that many of the nonreligious actually have some religious beliefs. For example, they observed that "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."  Out of the global nonreligious population, 76% reside in Asia and the Pacific, while the remainder reside in Europe (12%), North America (5%), Latin America and the Caribbean (4%), sub-Saharan Africa (2%) and the Middle East and North Africa (less than 1%). 
The term nones is sometimes used in the U.S. to refer to those who are unaffiliated with any organized religion. This use derives from surveys of religious affiliation, in which "None" (or "None of the above") is typically the last choice. Since this status refers to lack of organizational affiliation rather than lack of personal belief, it is a more specific concept than irreligion. A 2015 Gallup poll concluded that in the U.S. "nones" were the only "religious" group that was growing as a percentage of the population. 
- Importance of religion by country
- List of countries by irreligion
- Non-denominational Christianity
- Non-denominational Muslim
- Non-denominational Judaism
- Nontheistic religion
- Secular humanism
- Secular religion
- Spiritual but not religious
- Unitarian Universalism
- "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.
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無宗教 mushūkyō, "no religion", in Japanese language and mindset identifies those people who do not belong to organised religion. To the Japanese, the term "religion" or "faith" means organised religions on the model of Christianity, that is a religion with specific doctrines and requirement for church membership. So, when asked "what is their religion", most of the Japanese answer that they "do not belong to any religion". According to NHK studies, those Japanese who identify with mushūkyō and therefore do not belong to any organised religion, actually take part in the folk ritual dimension of Shinto. Ama Toshimaru in Nihonjin wa naze mushukyo na no ka ("Why are the Japanese non-religious?") of 1996, explains that people who do not belong to organised religions but regularly pray and make offerings to ancestors and protective deities at private altars or Shinto shrines will identify themselves as mushukyo. Ama designates "natural religion" what NHK studies define as "folk religion", and other scholars have named "Nipponism" (Nipponkyō) or "common religion".
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- "Will religion ever disappear?", from BBC Future, by Rachel Nuwer, on December 2014