The thing is, what we know about the gods is based on mythology, although the gods may have briefly appeared before some saints in the past. When you look at many of the ancient cultures, there were mythologies about the gods, for example, the Greeks, the Egyptians, the Babylonians, the Celts, the Norse. I just recommend researching this on Google Books if you want to learn more. Look up the book Atlantis and the Cycles of Time by Joscelyn Godwin if you want to be exposed to some alternative ideas about ancient history. If you look at some of this kind of literature, you will see that some say the gods once walked the earth during civilizations before recorded history. The Hindus hold a cyclical view of history and there were supposed to have been ages before the Kali Yuga. You can find a similar idea in Hesiod and Ovid. The Kali Yuga is supposed to be the most degraded age. Just be critical if you read any of that kind of literature, but it is interesting to be exposed to.