"I'll answer for Al: marriage is whatever the state says it is."
Bingo! It's also more than that but that is for those who freely attach themselves to the various dispensations. Marriage is a cultural creation that is highly malleable.
Al, I hope you realize that your frank admission here slams the door on any possibility of dialogue with you and your tribe. Before saying adios, let's try just one more experiment in a final effort to discover some common ground.
Statement: "A person is whatever the state says it is."
Question: Agree or disagree? If you agree, the party's over. If you disagree, please tell me what a person is, how you know this, and why marriage is a creature of the state while personhood is not.
I suspect that our commenter Thomas Aquinas has you nicely pegged:
"So, we are now back to liberal superstition. The belief that history is moving in an inexorably moral direction except when it's not moving in an inexorably moral direction ... I get it. You want what you want when you want it, and principles are nice fictions to dupe the suckers."