Warbler said:
therefore if a group set up church where gay marriage wasn't believed to be a sin and they wanted to marry homosexuals, they should be allowed to do it and the marriages recognized by the government?
Theoretically, but then again, I have no fixed opinion on the matter (of the legality of gay marriage). I believe it is wrong, but I don't think everything that is wrong should be illegal. I think other Churches (I assume you mean a Christian Church) should be allowed to criticize that Church and condemn its practice of gay marriages though.
But again, as I said, I am undecided at the moment on whether or not it should be legal or not. I have definitely decided it's wrong, of course, but legality is a whole other issue.