Back in Biblical times everyone was a brother and sister, or cousin, used as general terminology.<quoted text>
You post quotes from a third party and you tell me to carry on a "decent debate"? Are you kidding. You maybe contributed max 5 words to the above post.
And, I don't care about covenant, Exodus and chronology. You have sex with your mom or dad or sister or half-sister, you are committing an incestuous act. And, the medical consequences are well known, physical and intellectual infirmities to name just two. Were the latter two not a consequence of incest BEFORE it was declared verboten? If God is God, could he have not found a better way than incest to populate the earth? How'd he make Adam and Eve? Why did He just not continue thus?
Question: Could it be that Abraham never even met Sarah their whole lives, possibly a hundred years passed?