You aren’t going to end legal marriage in America, so why waste time talking about it in our time of crisis when we need to fight a political battle to preserve America?
In 1790-1890-1990- you could always have whatever kind of “marriage” you wanted with your partner, but to be legal, it had to conform to law.
In 1780 and 1794, and 1798, etc, when the feds were passing federal law on marriage benefits, they had to recognize your marriage as legal, it couldn’t just be whatever you wanted it to be.
Actually it could be, but it wasn’t legal.
If you don’t care if your marriage is recognized by government and the courts and law, then do what you want.
disregarding the religious vow aspect, from a government law perspective its origins is as procreation of family line contract ...that's why adultery and consummation the sexual acts factor into it...