Polygamy was always sinful in the OT. Always! That polygamy is related here and there in the OT doesn't mean God was OK with it. Read what Jesus said in Mt 19:4,5,6.
I agree it was a sin, always was and that is why I said, God compromised, his best men, from Abraham, to David, to Solomon and many in between took multiple wives and what did God do? he never even told them it was wrong, even when he used to speak to them face to face. In fact he made promises and covenants with them. In some cases God promised them more wives, had they only asked, see David for example.
From Adam to Exile of Israel, there is no rebuke for polygamy, on the contrary anti polygamy references only occur in mid exile and post exile prophets.
If God didn't compromise which I think he did, I'd say he condoned polygamy at one time.
Slavery in the physical sense - real physical slaves - is mearly an extrapolation of our spiritual condition.
Poetically, may be. but pragmatically no. There is no theological bond between this and that.
Killing ''women and children.'' As I said before, this is a modern concern, a recent evil. God is never OK with wanton killing of anyone, including men. However, when God ordered a people exterminated, or a town ''devoted'' to Him, He meant it. The Israelites repeatedly disobeyed God's will on this matter.
IMHO this is not nearly as modern as one would think. Jesus showed concern on this in the sermon on the mount, about killing and etc. But yes, even I agree that some people had to be abolished. My only concern always have been children, I never understand their killing. Sometimes I wonder if God actually called Israel to exterminate others? was it perhaps Israels own doings, just put under God's name for a seal of approval? But the bible says God said it, he ordered it. And when I see christ and back, I see God very different.
- Incest: we are looking at incest with modern eyes, with the prejudices and the revulsion that come from the conditioning of recent culture.
True, but I don't see it that way. Under Objective morality, either incest is always right or always wrong. Or else incest and many other things are subjectively moral. There is no middle road to take on moral issues.
These are some of the things that stand out to me in the O.T that I find in stark contrast to the nature of God, Christ speaks of.
What I am sure of is that God's Plan is unfolding as it should.
On that I agree with you.