Still, just sharing my POV. Not arguing. If at any point you wish to make this an argument, you automatically win. (-:
One more: In the event government "marriage" were abolished.., but polygamy remained illegal... what entity would publish and maintain the database that currently resides in county and state records, saying who is already married and who is not?
I'm talking about separation, not abolition. Government would do the contractual aspects of bonding. Churches would do the religious aspects of the bonding. Both are optional. There would not be a central religious database leaving in place the advantages and disadvantages of not having a central database of religious activity in America. The government can choose to maintain a central database of civil unions if they could get their act together across state lines, etc.
The reason I ask is that sometimes a closet bigamist will lead a double life, maintaining two households and sometimes two identities. It would be a minor burden for such a person simply to be married in, say, a Catholic Church AND in a Synagogue. If the two don't share records, neither church would be the wiser. This is part of the government's role in licensing and registering marriages.
I accept that a bigamist that has two marriages in different churches may well get away with it. It's none of my business though. It's none of the government's business either if it is a religious and not contractual bonding. There's a lot of stuff that goes on in marriages that is nobody's business other than the people involved. Some of it distasteful stuff. When it comes to joint property ownership through civil contract then I can see that good record keeping would be of commercial and civil value and that the government may want to maintain a central database of civil unions.
Yet another: What provision would be made for atheists who wish to marry? Currently all they have to do is take their license to a JP, ship's captain, or any number of other duly-appointed representatives of authority, and make their vows. I take it, under this proposal, that atheists would no longer be able to call themselves "married," but would have to call it something else.
Why would an atheist want to get married in a church? They can opt to go get a civil union bonding them contractually with another. They shouldn't use the term 'married' but we shouldn't use the term 'Xerox' either when we talk about multi-vendor photocopying. There's not a language police and I wouldn't start one. There seems to be developing terms to cover a civil union such as "life partnership" or "committed relationship". The English language is a beautiful thing in that it is infinitely flexible. If the separation of church and state principle were applied to marriage and civil unions consistently, I'm confident that the right term for a civil union-only bond would emerge and gain social acceptance.