With “gay marriage” being de rigueur, marriage itself might as well be busted down to “householding.” Any meaning transcending that needs to be in the bailiwick of the church, temple, or other “house of worship.” Whether it worships Jesus or Cthulhu or the Flying Spaghetti Monster.
But it really isn’t about just gay marriage. There’s an saying, IIRC, that when orthodoxy becomes optional it will end up being proscribed ...implied when those pushing for it to be optional finally get the camel in the tent.
Those trying to call this perverted dance never wanted to be just left alone, like your householding suggestion might lend itself to. They wanted acceptance, affirmation, and finally dominance.
This is ultimately about erasing the free exercise of religion, and ultimately Christianity proper.
That, if you’ll pardon the phrase, men (perverts in particular) might be found true ... end of story, no saying God has different ideas allowed.