Allow me to explain. Theologically, Christianity is based on Christ redeeming us from the Fall of man. If evolution is correct, which I personally believe it to be, then that shines some serious doubt on the validity of Genesis. If Genesis isn't true, then how could man have fallen, and if man didn't fall, why was Christ even necessary?
Could it be that Genesis is symbolic of man's general sinful disposition, and that it is that sinning that separates us from God?
Could it be that Genesis is symbolic of man's general sinful disposition, and that it is that sinning that separates us from God?