"Since they are campaigning for the legal right to civil marriage, what the hell has any church got to do with it....The various churches can currently turn away adherents of other faiths, so why would they have a problem with refusing gay couples....This fight is about CIVIL LAW, and the right to be treated equably under THAT law."

                Of course this fight is about Civil Law. And so were the lunch counter sit-ins in the 1960's. The courts decided that somebody running a lunch counter couldn't discriminate in favor of one customer over another.
                Why would it be different with churches. Once gay marriage is legalized across the nation--as I'm sure it will be--then if a church agrees to marry a straight couple, it would not be able to deny marriage to a gay couple.
                If you don't think there are people out there that will put this to a test, I don't know where you've been for the last 50 years.
                Once a church denies marriage to a gay couple, the ACLU will be all over it. The first thing they will attempt to do is to have that church's tax-exempt status revoked. They will go on from there.