1. beliefs and worship: people's beliefs and opinions concerning the existence, nature, and worship of a deity or deities, and divine involvement in the universe and human life
2. system: an institutionalized or personal system of beliefs and practices relating to the divine
3. personal beliefs or values: a set of strongly-held beliefs, values, and attitudes that somebody lives by
4. obsession: an object, practice, cause, or activity that somebody is completely devoted to or obsessed by The danger is that you start to make fitness a religion.
5. christianity monk's or nun's life: life as a monk or a nun, especially in the Roman Catholic Church
[12th century. Via French< Latin religion- "obligation, reverence"]
re·lig·ion·less adjective
get religion
1. U.S. to stop flouting the rules, regulations, customs, and expectations of society
2. to become a believer or join a religious organization, and, usually, start to lead a life that follows its teachings