Which is why the argument was put forward to not have government sanctioned marriage to begin with. Keep religion and government seperate. Not excised as I noted above, nor incorperated like the Taliban. Marriage is between those involved and their God/s.
Congregations who disapprove of their pastors/peachers violating scripture to allow gay marriage should be taking that up with their churchs. Have them removed, join a different church, or take whatever action your specific religion allows.
Once again, having the government put a gun to someones head, on issues other than genuine crime, is not a really good way to maintain a healthy society. Much worse in fact than any negative impact allowing certain religions to to perform such ceremonies would be. Especially in light of history that proves time and again that once the government gets used to the power of putting guns to peoples heads for issues like this, they eventually start pulling the triggers as well.
Oh well.... back to work. :-)