Don't try to put words in my mouth 7. Mosaic covenant and laws fixed a culture that was different from Abraham's era. In the context of hagar, it was within the cultural norms, which were outside of the bible. However, where God didn't specify a particular behavior as sinful, there was tolerance. That went away with God's greater revelation (same God providing more guidance to a nation, not individual).
And if God is the same, he NEVER progressed to God.
Well, I’m glad you don’t feel that way, your approach was a bit confusing though. While the law against Adultery was clearly found in the Law of Moses, there were other laws, not had by us now, to which Joseph referred when he said this:
Gen. 39:9 because thou art his wife: how then can I do this great wickedness, and sin against God?
God is the same.