human beings' relation to that which they regard as holy, sacred, spiritual, or divine. Religion is commonly regarded as consisting of a person's relation to God or to gods or spirits. Worship is probably the most basic element of religion, but moral conduct, right belief, and participation in religious institutions are generally also constituent elements of the religious life as practiced by believers and worshipers and as commanded by religious sages and scriptures.

The subject of religion is treated in a number of articles. For treatment of particular religious systems, as well as founders, reformers, and other religious personages, see biblical literature; Buddhism; Calvin, John; Calvinism; Christianity; Confucianism; Confucius; Eastern Orthodoxy; Greek religion; Hinduism; Islam (Islām); Jainism; Jesus Christ; Judaism; Luther, Martin; Middle Eastern religion; Moses; mystery religion; Protestantism (Protestant Heritage); Protestantism, history of (Protestantism); Roman Catholicism; Roman Catholicism, history of (Roman Catholicism); Shintō; Sikhism; Taoism (Daoism); Zoroastrianism. For cross-cultural discussion of religious beliefs and practices, see ceremonial object; creed; death rite; dietary law; doctrine and dogma; feast; myth; nature worship; prayer; purification rite; religious dress; religious experience; religious symbolism and iconography; rite of passage; ritual; sacrament; sacrifice; sacred; theology; worship. For philosophical and ethical aspects, see ethics; metaphysics; science, philosophy of. For a review of the efforts to systematically study the nature and classify the forms of religious experience, see religion, study of.