It's my sincere belief that Adam and Eve did not exist. Neither did the garden, and neither did the tree or serpent. That story was fabricated to explain why "survival is hard" - and because people like to have a place to stick the blame. It then evolved in the story as a convenient way to state that we're imperfect, sad, sorry sacks of "good for nothing" - which all points to why we "need" God to help us get "fixed". It's a giant mess of complaints, blame-shifting and pity-party nonsense. And people buy it because... hey... survival IS hard, and they ARE sad... and someone should clean up this mess, 'cause they are too feeble to do it on their own.
People like simple explanations - it's soothing. And the fact that so many people take their personal suffering personally has plenty of them casting around for explanations... and usually the simple ones are all they can handle.