I too, have no idea where to put this. It's a fantastic OP though so I want to put it somewhere.
The Bible: Accuracy and Inerrancy perhaps if you want to argue that the Bible reveals Original Sin and reason reveals something close to it, therefore the Bible may not be literally true, but is still in some senses, accurate.
Human Origins and Evolution might work, though at a stretch. If you want this to focus on the natural-meme versus theo-meme idea, it might work since it is kind of related to the origins of humans, ish.
Creation/Evolution Miscellany, just because...where else?
The above are in the science fora.
Bible Study might be an idea if we want to explore whether the Bible is really true in its claims of original sin, but don't want to necessarily have a science-heavy element to the debate.
This is Social/Religious issues.
If you can't pick between them, perhaps you could eliminate some you think are inappropriate for the direction of the thread. And then, if you want, I'll make a judgement call on whatever is left.