We had a similar problem with the Earth being flat. The church took a few figures of speech literally. Taught it as doctrine. And voila, "the Earth was flat according to the bible." Then somebody proved that false, and forced Bible scholars to look at it again and whaddayaknow; figure of speech. Since we weren't around prior to Adam and Eve, the account could be allegorical or a maybe God was trying to explain things in 4500 BCE terms.
Even if you discount everything prior to Moses you still have the sin problem and that's true for Jews as well. Man is clearly fallen -or did you skip your history lessons?
P.S.
Dear Slashdot,
Thanks for the flamebait!