Wanted to add to this. We now know King Tut was a product of an incestuous relationship. And he was a sickly child/adult.<quoted text>
Your argument that because some thing happened in the past means it should be acceptable today makes me wonder if, because Caluglia married his sister that should be the norm now?
We now know incestuous relationships more often than not cause severe deformities in offspring. That's why it's frowned upon and no longer the norm.
Wasn't too long ago cousins could legally marry in southern states. Second and third cousins still can, IIRC.
But I see you're still willing to cherry pick what you believe out of the Bible.
I clearly remember reading bible stories of mothers and sons making babies, brothers and sisters, fathers and daughters... and you're probably as peachy with that as you are about believing Noah's flood was the only flood worth mentioning.