Just finished Gilgamesh - apparently the oldest tale we have record of. What a stunning read - primitive yet delightful poetry giving some insight into an ancient way of thinking.
I have to add more as this has been playing on my mind. Not only is there another account of the flood with ark and pairs of animals predating the bible but a similar tale of Eve's leading Adam astray by tempting him. I'm no scholar but it seems plane that the apple from the tree of knowledge is a metaphor for some other fruit. Is this how it's always been? Men blaming women for tricking them into a life of knowledge and responsibility?
So there's clearly a oral history of a flood. One can only guess at the civilisation(s) lost.
But the best is that the hero, Gilgamesh is looking to find a way to deal with the fact that he's mortal and will die. The answer he gets is "that's how it is - get over it" (I paraphrase). Makes more sense than do this and that ritual, be one of us and you can live for ever.