True, according to the Bible, there is only to be one wife.
However, I have seen many American preachers laughed at Muslims' notion of four wives.
It is remarkable, how Jimmy Swaggart dared to point this out as a mocking statement before one of Muslim's great debaters, Ahmed Deedat, during an important meeting, and later committed adultery.
I supposed a preacher from a pornographic culture should be careful when he speaks of the holy matrimony of one husband and one wife.
But I supposed with its divorce rate, it's hard for these to be mindful of such things. 唉呀！美国的基督徒是最喜欢离婚的啦。有些为了在社会里留面子，不得不保持婚姻，做做样子。Not good? Bye bye, dump it, I want divorce!
I don't know where they got the guts to laugh at those who have 4 wives. I recently discovered a site: http://www.reformation.com/ warning Christians not to be hypocrites.
When the Bible speaks of 1 husband, 1 wife, 1 family, it is because this is a sacred relationship before God. Although wives are to submit to their husbands, both men and women are created equal before God. The husband gets the whole of his wife, and the wife gets the whole of her husband. There is no third person or forth person with equal level involved in this matrimony.