If I remember correctly, Jesus said, "Render unto Caesar what is Caesar's."
I think I believe it is Caesar's duty, our government's mandate, to provide equal security for all it's citizens, equal education for all its citizens, and to facilitate good business practices.
Perhaps it might behoove the "Anti-Gay Marriage" folks to be good dogmatists and practice minding their own business.
Let Caesar take care of its citizens in a fair and equal manor without freaking-out over semantics. No religious sect owns the word "marriage." The state issues the "marriage license" and should do so equally to its citizens. The only change made to that process might be perhaps to call it a "civil-union license" or similar phrase. But that is a superfluous argument at best.
I believe Jesus also said of God's blessings, "the greatest of these is love" and I don't think he said who gets to decide who got God's good blessings and who got God's bad blessings. We are under a new contract and the old law is completed - finished. We are supposed to judge ourselves, not others. That's God's job. And God is Love. Let Love rule. Let Caesar do his sworn duty, to protect all his citizens - equally.