A religion is an organized collection of beliefs, cultural systems, and world views that relate humanity to an order of existence.[note 1] Many religions have narratives, symbols, and sacred histories that aim to explain the meaning of life and/or to explain the origin of life or the Universe. From their beliefs about the cosmos and human nature, people may derive morality, ethics, religious laws or a preferred lifestyle. According to some estimates, there are roughly 4,200 religions in the world.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 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 59% of the world's population as "religious" and 36% as not religious, including 13% who are atheists, with a 9% 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.