The financial, legal, and social aspects of marraige are the only reasons gheys want to get married. It's not about god. God is the only reason that could possibly hold water among everybody on why they shouldn't get married. Other than that reason, there's none besides personal opinion/biases. Too bad for the separation of church and state. The only thing I can think of is to take it away from everybody and reform it without the state. That's the only way you could exclude people based on beliefs or sexual orientation. In doing that, you also open up doors to people starting all sorts of bogus churches and "little white chapel" type horseschit. It's not a fight that can be won in my opinion.