“This was blessed by the Bible that many in our nation revere.”
I’ll take issue with that. Jesus said one man, one woman make a marriage. Elders are required to be the husband of one wife by direction in the epistles. All directions to marriage, even in OT law, concern one husband and one wife.
The fact that Abraham had concubines and Jacob had concubines and two wives, David had several wives, and Solomon had goodness knows how many doesn’t mean God was pleased with it. Solomon’s many wives were blamed for his idolatry, as a matter of fact. Many sinful behaviors are described in Scripture. Lot slept with his daughters. That doesn’t mean it’s ok.
Where did Jesus condemn the “fundamentalist” Jews of his day who practiced polygamy? And the Parble of the Virgins certainly hints at polygamy, now doesn’t it?
Also, elders in the church were directed to have a wife (as were bishops) and the “one” issue has also been interpreted to mean that he never had been divorced.
Also, if Nathan specifically said that God “blessed” David with 6 wives that kind of says God had a hand in giving them to him, does it not? Or was Nathan not being honest?
Don’t forget that David and especially Solomon may have had additional wives for diplomatic reasons.