Maybe I should define myth. By myth, I don't mean it in the popular sense of, "something that didn't happen," but rather, "a folk story to explain why things are the way they are passed down from generation to generation," which is the anthropological meaning. Truth and historicity are irrelevant to whether or not something is a myth. It might be true, but that doesn't make it any less a myth. There are some who I love and respect who don't believe in a historical Adam, but I do. I do believe there was a man who disobeyed God as representative head over all humanity after him and thus led all mankind into an estate of sin and misery. Anything further on the historicity of things like an actual fruit or talking snake arent (to me) meant to be taken literal. The snake is a figure for Satan just as he is a dragon in Revelation, the Tree of Life is the offer of obedience to Christ just as Christ is the Tree of Life etc. Just because Genesis prologue isn't literal doesn't mean it didn't happen.