Firstly, Amenhotep and Ahmose-Meritamun were siblings. Brother and sister.
As for the gods, of course they're not real. They are a human contrivance. So their behaviour is based upon our own imaginings. In addition, they were indeed role models for the ancients. Hera was considered the perfect wife, conniving though she was. Soldiers dreamt of being like Herakles or Ares. Women hoped to be as beautiful as Aphrodite. This does not suggest an instinctive aversion to their behaviour. They did what we wished we could do.
Finally, you have not addressed my initial question. Here, I'll repeat it for you: What is morally wrong with two people who share parents to engage in a sterile relationship? Who does it harm? You can't say that all incestuous relationships inherently cause mental scarring to the two involved simply as a result of them being incestuous, because that is simply not the case. If they're unaware, their brains don't suddenly break the moment they kiss. In ancient Egypt, it was not considered wholly abnormal, so there was no social shaming, no guilt, no problems, morally or socially speaking.
Unless you can give me a rational explanation as to why, in all instances/b], incestuous acts cause harm to the individuals involved or anyone around them, I cannot find a reason to condemn those who participate in the act purely on the basis of the act itself.
