I seem to recall a lot of polygamy in the Bible. Does that comport with your view of "what God defined it to be"?
I don't think that is a standard that we can craft our laws on. The founders could probably have created a theocracy, but their experience led them in a different direction.
Only liberals scream “theocracy” every time God’s Name is invoked.
Sorry, but the founders of this free republic invoked God from Day One, as the very basis for our understanding of the basis of the rule of law, government, and any decent claim to liberty, and I will continue to follow their example.
“We hold these truths to be self-evident, that all men are CREATED EQUAL, that they are endowed by their Creator with certain unalienable rights, that among these are life, liberty and the pursuit of happiness. That to secure these rights, governments are instituted among men...”
And no, polygamy is contrary to the laws of God and nature.
Americans have always understood this.