Polygamy is ruled out in that, number one, God made them "male and female," not male and females, and, secondly, if you divorce and remarry, you are committing adultery. If polygamy was acceptable, it would not be a sin to remarry. She would just be your second wife.
But from the beginning of the creation God made them male and female. For this cause shall a man leave his father and mother, and cleave to his wife; And they twain shall be one flesh: so then they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder. And in the house his disciples asked him again of the same matter. And he saith unto them, Whosoever shall put away his wife, and marry another, committeth adultery against her. And if a woman shall put away her husband, and be married to another, she committeth adultery. (Mar 10:6-12)
Divorce is a sin because of the life long contract made between a man and woman is broken. Much like Jesus talks about the bride groom and bride and his life long commitment to us.
“ if you DIVORCE and remarry, you are committing adultery. If polygamy was acceptable, it would not be a sin to remarry. She would just be your second wife.”
The action word you used was divorce. So by marrying a second lady that was not a break of contract divorce so by scripture that would be acceptable.
“And he saith unto them, Whosoever shall put away his wife, and marry another, committeth adultery against her. And if a woman shall put away her husband, and be married to another, she committeth adultery. (Mar 10:6-12)”
There again the action word is divorce (put away), if that wasn’t important both times it would be noted. Example, Scripture would read whoever marries another person committeth adultery, but it doesn’t because “put away” divorce is the issue.
Don’t get me wrong I wouldn’t be married to more than one woman for any amount of money, but there are too many examples of polygamy in the OT. If you can truly show Scripture that condemns it I’m all ears, but I have searched high and low and it’s just not there.
Titus 1:6 King James Version (KJV)
6 If any be blameless, the husband of one wife, having faithful children not accused of riot or unruly.
1 Timothy 3:2 King James Version (KJV)
2 A bishop then must be blameless, the husband of one wife, vigilant, sober, of good behaviour, given to hospitality, apt to teach;
1 Timothy 3:12 King James Version (KJV)
12 Let the deacons be the husbands of one wife, ruling their children and their own houses well.
(1) G*d made them male and female
-> in no way does this dictate monogamy. bonobo chimps and most other animals are male and female, but not monogamous.
(2) if you divorce and remarry
-> does not conflict with polygamy as long as polygamists do not divorce their 2nd, 3rd and so on wives. The passages you cite disallow Male1 dissolving marriage to Female1, but this in no way disallows Male1 from a marriage to Female2, Female3, etc., while keeping the marriage to Female1. (Before you bring it up, I have not given it study, but it may be that the bible does not condemn polyamory either.)
In addition you avoided addressing altogether the fact that polygamists are described without criticism in the OT. If the OT is the word of G*d, then you must agree that G*d blew whatever chance he had of condemning polygamists in the OT.
Martin Luther read the bible and apparently agreed. The Mormons read the bible and apparently agreed.
At the very least, it is open to interpretation.
Of course, those with deep seated sexual insecurities may harbor strong internal psychological motivation to interpret the bible according to those deep seated sexual insecurities.