muslims have nothing to do with Isaac or any of the prophets of Israel. mohammad was not related to Abraham even through ishmael. mohammad was of pagan stock and his story was a glomeration of stories he heard about Judaism and Christianity. Prove me wrong!
Actually, we have nothing to do with Ishmael, Issac, Jacob, Joseph and others at all.
It is just that they happen to be the children and grandchildren of Abraham, whom we respect a lot, because Qur'aan declares Abraham as the most righteous/upright person in the sight of God Almighty.
Also, Muhammad was told to follow his ways.
It is Christianity that came from pagan stock and was marketed by pagans. The bigotry shown by Christianity is really amazing.