But without original sin, why do we need Christ's redeeming sacrifice?
If we evolved, why do we need God? What purpose does he serve in our lives? If He's just an allegory, screw Him.
On the other hand, the Genesis account is short of specifics on how God created man, and taking the Genesis account alone I see room for evolution as a method, as well as both the young earth and old earth accounts.
Or we could just scrap the Bible and go totally naturalistic, but then the basis for Christianity completely disappears, as does a basis for Christian morality.
It could be based on the morality of another religion, or even a morality of naturalistic philosophy, of course. But the last, at least, have not worked out too well, historically.
Good luck with that. "Polarization" is a common tactic on these threads, and there's no room for the uncommitted in those arguments.