I see this is a big deal so I will answer it. I called Pastor Jeff and asked him if there was a Biblical justification for polygamy and he said the Bible is filled with men who had multiple wives and with men who were instructed by God to take more than one wife. King David, Abraham, King Solomon, Jacob, and more all had multiple wives and so did Moses according to some people.
This part is from Pastor Jeff:
When read in the metaphorical context of the original Aramaic the use of the word 'wife' in the singular tense in Genesis and Deuteronomy denotes the relationship of marriage as being between a man and a woman but not between the women who were the wives of that man. In Aramaic a'aan tat is a wife and in the proper context you have to recognize that there is no plural form of a'aan tat in Aramaic because the relationship was not plural, it was singular between one man and one woman. Yet the man could also have other singular relationships that were not shared with anyone else. To clarify this, in Levitcan law a man could have multiple singular marriage relationships yet if a woman proposed to share a husband's relationship with one of his other wives she was breaking that law by laying with another woman. The sum of this is that the passages some people say are about monogamous marriage are literally about the relationship between a man and a woman not being shared with his other wives or concubines. Therefore, unless a man is a priest or a bishop or a deacon in the church he is not prohibited from having more than one wife.
To me it is simpler that God is okay with it because so many people are happy this way. It isn't perfect and it isn't for everyone I know but it is for some of us and no one should have a right to tell us we can't live this way.
The smell of fresh cut grass.