look if you believe in Jesus you have to accept the fact that 200 years earlier the same stories, rituals, and beliefs were formed during the lifetime of Mithras in Persia, which formed Mithraism....It's the same thing, Jesus is just a later version of Mithras. Actually it's proven fact that these stories of the NT did not come from the time period of Jesus, they are in fact a few hundred years earlier with a different savior who shed the blood of sins for all. And the whole event of a Persian messiah was prophesized 1000's of years earlier in the Zoroastrian book of creation. Even the Catholic fathers affirm the similarities
Now for the topic at hand. I don't see how God can always be based on belief, because most gods did not reveal holy books, or consider such revelation important. They were "experienced" in the present by the masses through oracles and miracles. So any myths describing the gods can be taken as symbolic stories of the actual living gods, the gods being real but not necessarily the "story." They were just written about the best way humans could understand them.