Well the Snake/Devil in Genesis appears everywhere, thousands of years prior. Quetzalcoatl with the Aztecs, and even Gobekli Tepe shows a snake in the sky.

I personally subscribe to Graham Hancock's theory that 11k to 12k years ago, in the Younger Dryas, a comet likely broke apart and caused a global cataclysm. The ice age meant 100+ meter thick ice sheets absorbed the impacts and a lot of the geological evidence (though some still does exist in the sediment layers).

The survivors all wrote stories about floods and the great evil snake in the sky. The Satan/Snake story is just another version of that old collective memory, passed though a few thousand year old game of telephone.