I've identified one of the reasons I'm so resistant to aligning myself with those who oppose gay marriage. It's primarily the offensive rhetoric that comes out of almost everyone who speaks from that group, even the more reasonable ones. An example is at the World Mag blog today:
As the institution of marriage is increasingly minimized through divorce, labeled irrelevant by co-habitation, and profaned through homosexual unions, the successes of this God-ordained sociological model are often forgotten.
Why is it that divorce merely minimizes marriage, and co-habitation merely labels it irrelevant, while gay unions profane it? The assumption is that divorce and co-habitation are normal, while gay unions are evil to the worst degree. A consistent biblical position on marriage is going to be as opposed to each of these. Malachi tells us that God hates divorce. Why is it that gay unions profane marriage but divorce doesn't? Co-habitation isn't a concept used in scripture, because there were really three kinds of sex in biblical times -- prostitution, adultery, and consummating a marriage. Any action that we would try to put in a third category would have been seen in those days as the third, at least to the Hebrew mind. So co-habitation is as much a perversion of the marriage relationship by denying the kind of relationship that's already there, treating it as if it's less than it is.
Why do I constantly see people who place this one sexual sin on a level worse than others that contain more frequent and often more strong language than anything about gay sex? Paul describes one instance on non-marital heterosexual sex in I Corinthians as united Christ with a harlot. Is that not a perversion? People who pick on one sin they don't struggle with and call it a perversion while not doing the same with the ones most Christians are going to have more need to see as really negative are doing a disservice to all of society. It's a mindset that reminds me too much of the Pharisees to want to associate with. That more than any other thing is why I will have nothing to do with any political action regarding homosexuality, at least until people who want to see change in that area start letting their Christianity affect their language.