You seem to be missing a pretty key point here. By reserving the word "marriage" to strictly religious use, the state isn't allowed to base visitation or tax laws on who is or isn't married. That would make as much sense as basing visitation or tax laws on who self-identifies as Baptist.Nope, I didn't actually miss that -- I just disagreed with it, though I expressed that badly. So let me try again:
"Marriage" is a word. Societies run on words; laws are written with words. Language belongs to everybody; letting special interest groups usurp parts of it for their own private use and declaring these parts of language out of bounds for the law is absurd. (Heck, a state couldn't even put a portal paragraph of the form you're advocating, say, "No state or county shall regulate marriage blah blah blah" in its constitution, if it couldn't *use the word* "marriage"!)
"Marriage" is a recognized ceremony in most major religions. If there's one where it isn't I'm not aware of it. That pre-dates any currently-extant law by quite a few centuries.Bullpucky. Any currently-extant law that touches on such basic things as kinship, family, ownership, and inheritance (not to even mention taxation and other more recent concepts) is more recent than organised religion only in terms of the specific statutes; any such law now in force has only replaced an earlier version, going back to, oh, I'd guess Hammurabi's clay tablets, *at least*. (Those tablets are only the oldest *preserved* laws.)
See my reply to the BOx; "common-law marriage" predates at least Christianity among the English-speaking peoples. And from all I've read of ancient Norse, Celts, and Anglo-Saxons, marriage *was* very much a "civil union" to begin with: You took a wife, had a party to celebrate if you could afford it, and didn't necessarily involve any shamans, priests, or druids at all. So if anyone should have to rewrite their texts and make up a new word for anything, it should be the religious nutcases, not civil society.
Basically, even if history weren't on my side (though it is), this comes down to something else: Who gets to decide what. Your idea, that civil society should have to abandon parts of language and let it be usurped by the religious nutcases in order to appease them, in effect amounts to putting religion above the law. That's bass-ackwards.