Adultery is 'biblical' too, but it's frowned upon in the bible.
Seems pretty clear to me that God's plan was for "a man to leave his father and mother and cleave to his WIFE (not wives) and the TWO (not three or four) shall become one flesh".
Further, there are multiple verses in the New Testament that specifically state that men in leadership positions in the church are to be the husband of one wife.
Seems pretty clear, God's preference is for monogamy.
Great points.
Sadly they will be lost on most Mormons. You see they must defend polygamy as ordained by God.
In fact it has been called beautiful and moral by several of them.