..about creation, Adam and Eve and the flood....disfavors the authenticity of these things when in fact it documents them?
If an occurrence happened to a group of people, and that group split, moved on made a new civilization, the stories from those early days would go with them. Names might change as well as other small details as the story is enhanced. but the stories are still there.
The fact that these stories are echoed in many early civilization....prove their authenticity...as they were carried forward into the the new civilizations that men made
So when we hear creation stories or flood stories repeated, we know these came from the source, as any other story that effected the root civilization, would be carried into the branches, this actually proves their truth and does not take away