Dictionary

Belief in a spiritual or metaphysical reality (often including at least one deity), accompanied by practices or rituals pertaining to the belief.

Example: My brother tends to value religion, but my sister not as much.

A particular system of such belief, and the rituals and practices proper to it.

Example: Eckankar is a new religion but Zoroastrianism is an old religion.

The way of life committed to by monks and nuns.

Example: The monk entered religion when he was 20 years of age.

Rituals and actions associated with religious beliefs, but considered apart from them.

Example: I think some Christians would love Jesus more if they weren't so stuck in religion.

Engage in religious practice.

Indoctrinate into a specific religion.

To make sacred or symbolic; sanctify.