God, Yahweh is righteous and cannot do anything which is not righteous. Yahweh gave David many wives.
Polygyny, monogamy and abstinence are all acceptable and righteous to God.
We (mankind) tend to interpret things to our own ways of thinking. It is God's will we should follow not our own. If we look at ourselves through time our will and or ideas change to which way the wind blows or in today's lingo what is "politically correct". God's will, old testament / new testament never changes. God is good. God cannot sin.
Polygyny (not polygamy in general) is not a sin and is not against Christianity.
God blesses the seekers of the truth and the way.
May God bless you.
So is this a question or a statement?
Because although your title was a question what you said is more of a statement.
Anyways, we do see from the Old Testament that polygamy was acceptable, but by what reason was it? Was it what God originally intended or something he allowed out of necessity?
One thing I like to remember, is that most of these people mentioned in the bible with multiple wives, were people of great power and wealth, and the world back then was so much harder than it is nowadays. So many things could happen that would cause your children to pass away, and if a man of power had all of us children pass away then who would inherit what he owned? So, they could have taken another wife because a woman can only bare so many children, and if he wanted more, he would have to take another wife. So I still see this as a necessity, much like how God would allow the Israelites to go to war, and put to death other men because it was neccesary that they keep a good defense, and keep themselves pure and get rid of that which isn't pure. This is not something God intended, but it was something that was neccesary. God is very understanding, and that is why he allowed this to occur in the Old Testament.
To back up what I said as for a monogamous marriage is what God intended, I would have you look at Genesis 2:24.
Genesis 2:24 said:
Therefore shall a man leaves his father and mother, and shall cleave unto his wife: and they shall be one flesh.
Right here, God defines marriage and tells us that it is meant for a man and a woman, not a man and women. If God intended man to have multiple wives, he would have said wives rather than wife.
Now, let's take a look of how polygamy is viewed in the New Testament.
Matthew 18:3-9 said:
3The Pharisees also came unto him, tempting him, and saying unto him, Is it lawful for a man to put away his wife for every cause? 4And he answered and said unto them, Have ye not read, that he which made them at the beginning made them male and female, 5And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh? 6Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder. 7They say unto him, Why did Moses then command to give a writing of divorcement, and to put her away? 8He saith unto them, Moses because of the hardness of your hearts suffered you to put away your wives: but from the beginning it was not so. 9And I say unto you, Whosoever shall put away his wife, except it be for fornication, and shall marry another, committeth adultery: and whoso marrieth her which is put away doth commit adultery.
Jesus right here reinforces what is said above, that it is "twain" (Which means two) that are made one flesh. Not three or more, but two. That's what the marriage is. Also look and see that if you marry another and have sex with her, it's considered adultery because God bound you with the woman whom you married first.
1 Timothy 3:2 said:
A bishop then must be blameless, the husband of one wife, vigilant, sober, of good behavior, given to hospitality, apt to teach;
1 Timothy 3:12 said:
Let the deacons be the husbands of one wife, ruling their children and their own houses well.
Titus 1:6 said:
If any be blameless, the husband of one wife, having faithful children not accused of rebellion or unruly.
As we see from these verses, one of the set rules for a bishop is to have but one wife, if God did approve of polygamy, why would he have included this among other good qualities a bishop should have?
Ephesians 5:22-33 said:
22Wives, submit yourselves unto your own husbands, as unto the Lord. 23For the husband is the head of the wife, even as Christ is the head of the church: and he is the saviour of the body. 24Therefore as the church is subject unto Christ, so let the wives be to their own husbands in every thing.
25Husbands, love your wives, even as Christ also loved the church, and gave himself for it; 26That he might sanctify and cleanse it with the washing of water by the word, 27That he might present it to himself a glorious church, not having spot, or wrinkle, or any such thing; but that it should be holy and without blemish. 28So ought men to love their wives as their own bodies. He that loveth his wife loveth himself. 29For no man ever yet hated his own flesh; but nourisheth and cherisheth it, even as the Lord the church: 30For we are members of his body, of his flesh, and of his bones. 31For this cause shall a man leave his father and mother, and shall be joined unto his wife, and they two shall be one flesh. 32This is a great mystery: but I speak concerning Christ and the church. 33Nevertheless let every one of you in particular so love his wife even as himself; and the wife see that she reverence her husband.
As we see from here, the marriage between a man and woman is to be modeled after the marriage between Jesus and the church. Jesus has only one church, and this one church is his wife. This is how we are to model our earthly marriages, after his monogamous marriage with the church.