Sorry, where does God say this? You are a Christian right? I'm not aware of any verse in either the OT or NT that calls for monogamy. Jacob has four wives, Abraham has two, David has quite a few and Solomon has hundreds. The only verses that seem to say anything negative in this regard are some which imply that Solomon just has way too many. The text strongly implies that polyandry is not ok but polygyny is fine. The closest claim is Jesus's point about how divorcing one woman and then marrying another is adultery, but that's a much more limited claim (it could be that the other woman was unwilling to be a second wife for example). 1 Timothy chapter 3 lists qualifications for being a church leader which include having only one wife. That would seem to imply that having more than one wife is at worst suboptimal.
That is a really good point. (Actually, Jesus made a stronger point than that: even lusting after someone you're not married to is adultery.)
You know, you could actually be right. I'll have to look more carefully. Maybe my understanding has been biased by the culture in which I live. Upvoted for knowledgeable rebuttal of a claim that might not be correct.
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