There are two ways that I can show that God wanted polygamy. One is in terms of His law, and the other is in terms of His actions toward polygamists.

In terms of law, God's law contained several rules that regulated the practice of polygamy. If polygamy were wrong, then God would forbid such practices entirely as opposed to just being concerned with how it is practiced. Ask yourself, if gay marriage was immoral, would God be concerned with how (assuming there was a good or certain way he wanted it) it was practiced, or would he ban the practice entirely?! The strongest case of a law that supports polygamy is the law on 'adultery'. I consider this to be the strongest case because it is part of the 10 commandments, and these laws would carry over even into the NT. Anyways, my point on adultery is how it is defined, which is as follows:
"An adulterer was a man who had illicit intercourse with a married or a betrothed woman, and such a woman was an adulteress"
https://www.biblestudytools.com/dictionary/adultery/ (also here and here).

What I gather from this definition is that biblical adultery doesn't prohibit the husband from sleeping with all women, but rather it only prohibits him from sleeping with a woman who belongs to (married) to another man. Meanwhile, a married woman is prohibited from sleeping with all men besides her husband because the man who sleeps with her would be sleeping with a woman who belongs to someone. What would be the purpose for such unequal terms if not to be a tailor-made for polygyny? Also, you can further understand what adultery meant to the Jews based on how they and God enforced it. God NEVER condemned the act of a married man taking another woman (a single one) to be his wife, but yet he always condemned the married man who tried to take someone else's wife.

In terms of God's actions, polygamy is moral when the all-good God acts to support such marriages. We find the best case of this in Genesis 29:30-33, where we find that God is concerned with ONE man who does not love TWO wives. The all-good God then acts on his concern by helping one husband to love TWO women, and that is by helping both women to be fruitful. To put this in perspective, let's think about gay marriage since Christians are so against that. Would an all-good God that considers gay marriage to be immoral be concerned that two guys don't love each other? Would he intervene in their relationship in order to get both guys to love each other?!

Debate topic:
1. Given the above points, can we say that God is okay with polygamy? If not, then please offer a logical and evidenced based case that addresses my view and that of others who argue for biblical polygamy.
 
How many topics on polygamy are you gonna create? :rolleyes:

Sarah and Leah were involved in constant quarrel and jealousy. That is not loving relationship at all. Furthermore, can we really say God was concerned for polygamy? You may be reading more into the passage than what's there. Jacob ended up having kids with these two women, but Gods concern in this relationship would be that the kids and women are taken care of. Jacob was to take care of Leah in the context of marriage. But Rachel would only be taken care as a servant, as in no marital relations since she was not his valid wife.