Polytheism is the worship of or belief in multiple deities usually assembled into a pantheon of gods and goddesses, along with their own religions and rituals. ...It is a type of theismThough the most widely known religions today — Christianity, Judaism, and Islam — are all examples of monotheism, there have been plenty of religions that preachpolytheism. Followers of those religions believe in a pantheon or group of gods, like the ancient Greeks who worshipped Zeus, Athena and the gang.