As long as the government doesn't go after churchs forcing them to marry gay couples, I think the debate will fizzle.
If it did, I'd be right there arguing on the side of the churches. freak that noise. The government doesn't force the church to marry people who aren't members of their church. I see no reason why gay marriage would be the place to start, and none of the gay folks I know have any desire to get married in a hostile church. There are always assholes, though.