I don't doubt for a minute that straight marriage is one of the tenets of your religion.
Nor, in case that bit wasn't clear, do I doubt that there are plenty of gay people who are good Christians and for whom it would be completely appropriate to have full-scale church weddings. But it's not the state's problem or mine if there are Christian groups who don't want gay weddings in their churches, any more than it's the state's problem or mine if you put a sign saying "No Blacks" on the loo door in your own home.

Peter