This is my candid suggestion and advice, one that is most suitable to avoid any controversy. Jesus made it clear that he will build his church and the gate of Hell shall not prevail. But it's like Hell Gate is about entering into the holiest place within the body of Christ; the spirit of God will not allow this to come to pass.
The Church of Satan is a better option for same sex couple to go get married. May this is one of the underlining reason for the establishment of such churches with a strange and scaring name. Anything goes there, and i see no reason why they waste their time with the conventional churches. It's only a suggestion anyway, but i think it makes a whole lot of sense when you examine this issue critically with an eagle eye.