Some cultures simply didn't get around to organising their mythology in the written word until quite recently. Wars, illiteracy, invading Romans, invading Spanish, invading British, etc....
Did we ever establish where we stand on Q's that ask about pop culture versions of mythologies? I.e. I know we had a question about Marvel Thor versus mytho-Thor.
Yes exactly. But from our point of view, or the casual reader's POV, there's little difference nowadays. Most people don't know which are the original sources; they're just stories.
I haven't posted an answer today :/ I'll have to get my writing cap on tomorrow. There have been several questions I know the answer to but just haven't answered :/