If you assert a higher power with a more advanced moral code than mine would condone selling women into sexual slavery I am pretty sure you have already lost the argument.

But that higher power isn't even consistent with its own moral code. Remember when it sent bears to maul a bunch of children for teasing a bald dude? I assume you will say it is foolhardy to assume it is morally wrong to maul children to death for a childish mistake? That's absurd, though, the Commandment is not killing. Maybe god should have tossed in an eleventh: "bald dudes are off-limits, kids, bother someone else."

From a purely rational perspective, I have to reject the Abrahamic religions as being fantasies from cultures with barely developed moral codes, as that is the infinitely more plausible explanation.

If I cannot find my keys, I don't "from a purely rational perspective" have to accept that pixies might have hidden them. Rejecting the existence of mischievous pixies has nothing to do with my emotions towards pixies.