Yeah, definitely a retard.
I'm not a christian and don't have a lot of time for it at all, but it's not even condemned in the bible.
Little known is that Christianity doesn't condemn polygamy at all, infact it is allowed but it's not popular with "traditionalists" and prude pastors who haven't truly read the bible for a long time and are influenced by their concessions to the outside liberal world. In Deuteronomy 21:15-17 we see clearly written that polygamy is allowed, however it is also allowed even earlier in the bible at Exodus 21:10.
Of course, there are expectations, as it states in these two passages. In Exodus you're allowed as many wives as you want, so long as you are able to provide for your first wife and the rest of them. Later on in the New Testament Paul calls providing for your wife (or wives) giving her due benevolence. In Deuteronomy it explains that if you come to love the mother of one whom is not the first born more than the mother of the first born then this should not interfere with his birth right. Detractors of polygamy often refer to Deuteronomy 17:17. Not only is this not a condemnation of polygamy in any case if we consider that later on in Deuteronomy it specifically allows for polygamy, it is only speaking to kings or a lone king and it only says he must not take "many" wives. Of course we find out what the limit is through biblical and historical wisdom later on in 1 Kings 11:1-4. We learn that King Solomon had 700 wives and 300 concubines. While admirable from a man's point of view, there is not enough time in the world to give enough love and attention to all of these women or get anything else done in the day.
Solomon didn't sin because he married more than 1 woman, we find out the reasons why when we read verses 5-13 of the same chapter and also verses 1 and 2 of the same chapter. Unlike King David, whom married Abigail and Ahinoam (1 Sam.25:42-43; 30:18), then later took more wives (2 Sam.5:13). Infact, in 2 Samuel 12:7-8 we find out that God had specifically given and allowed David to haves these wives and would have given him many more if it were not enough.
There is actually not one single passage in the New Testament which condemns polygamy or deems it a sin, nor does it class it as adultery. Maybe by our current laws and by the Roman catholic church, but not by the bible. Adultery carried the death penalty, polygamy didn't, so it's clear to see that they are not the same thing. As for the "one flesh argument", it is in reference to breaking up. Unless on the grounds of adultery, divorce and remarriage is not allowed. The often quoted passage in Matthew is concerning divorce, not polygamy. As I said, it is against splitting up, and polygamy is joining on. A man can be one flesh with his first wife, and one flesh with his second wife, and one flesh with his third wife and so on. Abraham and his polygamy is acknowledged by Paul in Galatians 4:22 without a hint of malice or condemnation also. Think of it this way, if a prostitute can become one flesh when she lays with many men then how can a man such as King David with many wives not be one flesh with the wives God gave him?
TL;DR: For those who can handle more than one woman, have high sex drives and take care of them all as is commanded in Exodus then I see no problem with it, personally. It's better to have multiple wives in faith and not be tempted to sin than to have one wife and led to temptation.