"Polytheistic" is an adjective for a person, society or religion that worships many gods. The word comes from the Greek roots "poly-," which means "many," and "theos," which means "god."
Polytheistic societies were once the norm throughout the world, and many works of classic literature, including "The Odyssey," "The Aeneid," "The Prose Edda" and "The Epic of Gilgamesh" are infused with a polytheistic worldview. However, the great evangelistic religions Christianity and Islam are aggressively monotheistic; they call on followers to believe in not many gods, but one God. As these religions spread, they obliterated or subsumed polytheistic traditions. Today among the most common religions, Hinduism and some forms of Buddhism remain polytheistic.