Heracles

Read the passage from Heracles.

Heracles was the son of Zeus, a god, and Alcmene, a mortal. Zeus's wife, Hera, hated the child, who was originally named Alcides, but was renamed Heracles in a failed attempt to appease Hera. Out of jealousy, Hera tried to kill Heracles as an infant. But she failed and Heracles grew to manhood, gifted with supernatural strength. Hera succeeded in driving Heracles insane, causing him to kill his wife and three children, after which Heracles exiled himself in shame.

Based on the passage, what did the ancient Greeks most likely believe about their gods?