The debate on polygamy, and what God says about it, will not go away soon. Whereas Islam recognises polygamy as long as one demonstrates ability and does not supersede wife number four, Christianity is categorical about one man, one wife.
The New Testament is clear that monogamy is the way to go, but it is not uncommon to find pastors and religious leaders in polygamous unions justifying their actions by quoting the Scriptures from the Old Testament.