Actually, no, there doesn’t have to be.
Hi granny, it’s nice to see see your posts again. I catch up on your nitty-gritty thread when I have the chance, which isn’t so much anymore, I’m afraid. I’m playing the adjunct game again, working at three colleges, which doesn’t leave much time for anything other than lecture prep and commuting.
I think the Catholic church has painted itself into a corner on this one by backing the historicity of Adam and Eve, and even more so by insisting on them as a unique pair of progenitors. These aren’t spiritual matters; they’re physical, and the evidence doesn’t motivate that conclusion.
Apologists can’t paper over the coalescence times for markers off the mitochondria and Y chromosome by looking at these two, minor genetic regions exclusively. Population genetics will keep on looking at the rest of the evidence. The coalescence with the neanderthals predates the appearance of anatomically modern humans by hundreds of thousands of years. If some of us carry their code, and some do not, that means our common ancestors, as humans, were not anatomically modern. In simpler terms, they wouldn’t look human. They’d be a more primitive and apelike predecessor of humans and neanderthals:
http://upload.wikimedia.org/wikipedia/commons/f/f2/Sapiens_neanderthal_comparison.jpg
It’s not useful to presume a campaign against Adam and Eve. It’s not likely to be true, and meaningless even if it were. The evidence exists objectively; it is what it is, independent of our wishes. If we follow the evidence, it’s with the motivation to explain what we see here in the physical world. If that just so happens to align with a sacred text of some religion, it’s bound to do so at the cost of contradicting another. There’s no scientific benefit in taking such considerations into account.
As ever, Jesse