It must be fun being an arch-conservative. When everything you are doing fucks up you can trot out the spectre of the fags coming to take over the world. I mean, what do the left have to scare people with? Global warming (it's a fucking fact dammit!), rapacious corporations, lying politicians, thousands dead in Iraq with no end in sight (and the terrifying possibility of W doing worse to justify his already fucked actions). It doesn't seem to scare the voters as much as the poofs and dykes do.
It's a really simple argument that a lot of people go out of their way to obscure. Point one: do you think marriage is important? If not, the conversation's over (unless you just like arguing - if so, good for you. Fuck off and bother someone who cares.) If yes, point two: do you have a problem with homosexuals? If not, the conversation's over. If yes, admit it and I'm fine with that. You don't want same-sex marriage because you don't like gays or gay sex creeps you out or it's against God or nature or something. That's fine. You admitted it. We know what we're arguing about.
If you think you don't have a problem with gays but you don't want them to get married because marriage is only between men and women, I have some advice for you:
Stop. Fucking. Lying.
I don't know if you're lying to yourself but you're sure as shit lying to me. It's pathetic. You're homophobic - live with it. You don't like the fags. Hey, a lot of them probably don't like you. Spend all their time making fun of "breeders". So cheer up - some gays are heterophobic.
If we take the religion element out (and any religion should be able to ban gay marriage within the religion - religions are all about rules and restrictions) then we are left with the legal status of relationships. In my (not very humble) opinion, telling someone their partner has no legal status with regards to property, benefits, inheritance etc. solely because of their gender, is just fucked up. Can I be really negative and fatalistic for a minute? People talking about the "sanctity of marriage" needing to be protected from homosexuals are either delusional or lying (see homophobic, above). With a 50% divorce rate and fuck knows how many affairs going on, marriage has no sanctity - deal with it.
And then there's the "slippery slope" argument. If we let the goddam fags get married, then there's the polygamists probably closely followed by pedophiles and then the beastiality crowd. We'd be opening the flood gates I tells ya. My answer to that is as follows: my brain works in this funny way where I'm able to assess individual propositions on their own merits. I'm not limited to coming up with one conclusion to cover all eventualities. It's this crazy thing where I don't stop thinking. Weird, I know.
If gay marriage becomes legal and polygamists want to use it as a precedent to further their agenda, good luck to them. To me, they're two different propositions but if they can find someone dumb enough to agree that they should be allowed to have extended marriages solely because gay unions have been recognised then they must be pretty damn good debaters. Or they're debating with some pretty damn stupid opposition.
Oh and by the by, if you want some interesting and intelligent discourse on the topic of polygamy from a Muslim perspective, look here and here and follow some of their links. I like to end on a positive note.