I (as a Christian) think that a religious rule shouldn't be enforced by the government. If it doesn't actually hurt anyone and it's simply a religious rule, non-Christians shouldn't be expected to follow it. To quote C.S Lewis from his book Mere Christianity:
"At least I know I should be very angry if the Mohammedans tried to prevent the rest of us from drinking wine. My own view is that the Churches should frankly recognise that the majority of the British people are not Christians and, therefore, cannot be expected to live Christian lives."
This was on the subject of Christians pushing their views of divorce on the government, but it holds equally true for same sex marriage.