Look... the concept of separating the church and the state is rooted in the notion that there are separate agendas for each.
Politicians and religious big-hats tend to cross the boundaries between their domains when the rest of us are busy screaming "You are not the boss of me!".
Never mind that this makes everybody sound like 5 year olds... the fact remains that organized religion is an opiate for the masses that cannot think for themselves and grew in a time when people tended to die before they were 30 from food poisoning and ... well, being killed by the next person to knock on their door. And Politicians? They are the back-end of government which is there to accurately count things and organize a military.
There may very well be nations and peoples out there that are happy to be dragged through existence by their religious leaders and states that are willing to blindly let their politicians tell them what to think but last time I checked... I didn't live in one of those countries.
The only reason same sex marriage is on the agenda is to establish non-draconian, non-Victorian property rights and tax laws that respect the notion that same sex couples can be just as committed and just as caring as any other type of marriage. The church and the government have absolutely no defendable right to hang around in your bedroom and tell you what you can and can't do... and they shouldn't have any right to tell the population whom they can love and how. But that is an old argument. This one has more to do with why a heterosexual couple is more deserving of the benefits that our tax dollars support than a gay couple.
It doesn't seem to matter to the government or the church when their hands are out asking for money who we call our partner... but now that these couples are getting old enough to know that they deserve pay back just like the rest of society... everybody has to whip it out and have a pissing contest about the issue. They're the worst kind of hypocrites ever.
Fuck that and screw you. The Nitty Gritty Dirt Band said it best with "Do your own thing, and don't touch me!"