the Bible, polygamy, and a consistent Christian worldview of government
cross-posting a comment I made on Veritas Rex...
The ideal is marriage between one man and one woman. This is enumerated from the beginning-- as Jesus notes in Matthew 19:4-6 by quoting Genesis 1:27 and 2:24.
That said, polygamy was actually *commanded* in some contexts under what is called "levirate marriage". (This is described most diectyy in Deuteronomy 25:5-6-- and is not at all synonymous with the reference to the sinful polygamous practices of David and Solomon.) There is a famous failure to obey this command in Genesis 38:8-10 which is punished directly by God through death. And there is an interesting implied failure and a grand success in this regard in Ruth 4-- the latter of which, quite interestingly, ends up in the lineage of Jesus Christ (Matthew 1:5).
I don't see how one would make a Biblical case for universally forbidding polygamy. Beyond that, I cannot imagine a Biblical case for Christians pursuing such a prohibition through government activism.
Unfortunately, the inability to place such things within a consistent Biblical worldview doesn't stop a lot of people from holding those beliefs. My prayer is that their efforts only give Truth a small black eye and only cause modest damage to the Kingdom.