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Religion (from O.Fr. religion religious community, from L. religionem (nom. religio) respect for what is sacred, reverence for the gods, obligation, the bond between man and the gods) is derived from the Latin religiÅ, the ultimate origins of which are obscure.
They believed in service to God and others. In the Roman Empire, Mithra became associated with the sun, and was referred to as the Sol Invictus, or unconquerable sun. The first day of the week -- Sunday -- was devoted to prayer to him. Mithraism became the official religion of Rome for some 300 years.