Polytheism

Polytheism is the belief in, and consequent worship of, many gods.

From the 1913 Catholic Encyclopedia

Polytheism — The belief in, and consequent worship of, many gods. See the various articles on national religions such as the Assyrian, Babylonian, Hindu, and the ancient religions of Egypt, Greece, and Rome; see also ANIMISM, FETISHISM, TOTEMISM, GOD, MONOTHEISM, PANTHEISM, etc.