Final answer:
polytheistic, Believing in many gods is termed as polytheistic.
Step-by-step explanation:
The term for believing in many gods is polytheistic. Polytheism is a religion based on the belief in multiple deities. It is the opposite of monotheism, which is a belief in a single deity.
Examples of polytheistic religions include Ancient Greek and Roman religions, which had multiple gods and goddesses with different responsibilities and characteristics.