Remember the promise to be faithful to the wife of your youth by bedding more women? Your position is untenable. Look at David commit adultery and murder, and you say, hey, it is okay. Wow. NO. IT IS NOT AND NEVER WAS OKAY.
Oh my goodness, your examples leave much to be desired. Sarah gave Abraham her handmaid because she did not wait upon the promise of our Lord to be fulfilled (did she even believe it?), and look at all the problems it caused, and causes to this day. That wild ass of a man whose hand is against everyone, this you think is an okay outcome? I know you don't.
There is zero evidence that Moses was a polygamist.
Do we not all have one Father? Did not one God create us? Why do we profane the covenant of our ancestors by being unfaithful to one another?
11 Judah has been unfaithful. A detestable thing has been committed in Israel and in Jerusalem: Judah has desecrated the sanctuary the Lord loves by marrying women who worship a foreign god.
12 As for the man who does this, whoever he may be, may the Lord remove him from the tents of Jacob—even though he brings an offering to the Lord Almighty.
13 Another thing you do: You flood the Lord’s altar with tears. You weep and wail because he no longer looks with favor on your offerings or accepts them with pleasure from your hands.
14 You ask, “Why?” It is because the Lord is the witness between you and the wife of your youth. You have been unfaithful to her, though she is your partner, the wife of your marriage covenant.
15 Has not the one God made you? You belong to him in body and spirit. And what does the one God seek? Godly offspring. So be on your guard, and do not be unfaithful to the wife of your youth.
16 “The man who hates and divorces his wife,” says the Lord, the God of Israel, “does violence to the one he should protect,” says the Lord Almighty.
So be on your guard, and do not be unfaithful.