The ancient Egypt idea could lead to some odd places - didn't the pharoahs of ancient Egypt believe that they must marry their sisters?
All religions/cultures lead to "odd places" if one thinks about it. Some are more unfamiliar to us (depending...) than others which is why I think that a lot of care needs to be taken when changing a character's belief system to one that isn't the norm (and more likely to be seen as "odd").
alcyone
