Polytheism is the belief that there are many gods. Breaking the word down, “poly” comes from the Greek word for “many,” and “theism” from the Greek word for “God.” Polytheism has perhaps been the dominant theistic view in human history. The best-known example of polytheism in ancient times is Greek/Roman mythology (Zeus, Apollo, Aphrodite, Poseidon, etc.). The clearest modern example of polytheism is Hinduism, which has over 300 million gods.