Then you've got Hindu deities, Aboriginal Australian beliefs, Chinese folk religion, North and South American Aboriginal beliefs, African deities etc...<quoted text> It's only myth to us. Who started Canaan? The Oldest and Most Important text of all Time would be the Sumerian Text. They spoke of Beings/Gods! I don't think, can just Dismiss that as some crazy Delusion! I was looking over that Sumerian Kings List, Wow! That is Documented and Powerful stuff! Laid Right at a Mans Doorstep! From that time forward, either the Christian God or the God of Ancient Sumerian, or both( Good, Evil) was probably every One God that was handed down, only Renamed in each Culture. With the Sumerian Text being the Oldest Known Writing, there is no other way it could be..At least til an Older Writing is Found and that is Unlikely..
To assume all deity beliefs/mythologies come from an singular and original source or story isn't being realistic. Regionally, some may borrow from others, and then use certain aspects from the preexisting mythologies in crafting their own, but to think they >all< spring from an original story is pushing the limit.