Judaism didn’t create marriage. God created it.
Yeah, yeah, is there a larger point you’d like to make, gentlemen?
Though I'm not quite sure what happens to Polygamy, Biblically. The Patriarchs and Kings were not one-woman men. And this is never explicitly repudiated. It does seem, historically, that polygamy had become rare among the Jews--- if it had not faded out entirely --- by the Christian era.
I read articles on this a while back in the Jewish Encyclopedia online (both on Monogamy and on Polygamy) and --- if I'm remembering correctly -- over the centuries just before and just after the time of Christ (though they didn't describe the timing that way) it gradualy disappeared. There wasn't a General Council of some kind that specifically rejected it. Polygamy simply became, for most of Judaism, a moot point. Anybody have more information on that?