Many religions may have organized behaviors, clergy, a definition of what constitutes adherence or membership, holy places, and scriptures. The practice of a religion may also include rituals, sermons, commemoration or veneration of a deity, gods or goddesses, sacrifices, festivals, feasts, trance, initiations, funerary services, matrimonial services, meditation, prayer, music, art, dance, public service or other aspects of human culture. Religions may also contain mythology.
The word religion is sometimes used interchangeably with faith, belief system or sometimes set of duties; however, in the words of Émile Durkheim, religion differs from private belief in that it is "something eminently social". A global 2012 poll reports that 59% of the world's population is religious, and 36% are not religious, including 13% who are atheists, with a 9 percent decrease in religious belief from 2005. On average, women are more religious than men. Some people follow multiple religions or multiple religious principles at the same time, regardless of whether or not the religious principles they follow traditionally allow for syncretism.
Religion (from O.F.r religion "religious community", from L. religionem (nom. religio) "respect for what is sacred, reverence to the gods", "obligation, bond between man and gods"), is derived from the Latin religio, the ultimate origins of which are obscure.
Some scholars classify religions as either universal religions that seek worldwide acceptance and actively look for new converts, or ethnic religions that are identified with a particular ethnic group and do not seek converts. Others reject the distinction, pointing out that all religious practices, whatever their philosophical origin, are ethnic because they come from a particular culture.
In the 19th and 20th centuries, the academic practice of comparative religion divided religious belief into philosophically defined categories called "world religions." However, some recent scholarship has argued that not all types of religion are necessarily separated by mutually exclusive philosophies, and furthermore that the utility of ascribing a practice to a certain philosophy, or even calling a given practice religious, rather than cultural, political, or social in nature, is limited.
The current state of psychological study about the nature of religiousness suggests that it is better to refer to religion as a largely invariant phenomenon that should be distinguished from cultural norms (i.e. "religions").
Some academics have divided religions into three broad categories:
- world religions, a term which refers to transcultural, international faiths;
- indigenous religions, which refers to smaller, culture-specific or nation-specific religious groups; and
- new religious movements, which refers to recently developed faiths.