Gay marriage supporters deny the claims by refuting the authoritative worth and/or truth of the bible, which is the only possible reason homosexual behavior can be seen as immoral. This makes me happy on a few levels. Since the America is pretty evenly divided on the morality of homosexuality, that means roughly half the population refute the authoritative worth and/or truth of the bible. Considering how many people belong to Bible-centric religions in the US, this means that most of them aren’t nearly as sold on their faith as survey data shows. They are my favorite kind of Christians--those that are Christian in name only. The most secular gay marriage supports make the accusations against them nonsensical in their warranted rejection of “sin” as a concept.
The opponents of gay marriage originally pushed that homosexuality was a choice, but this argument didn't hold up. First, there was a problem calling the majority of those who are an authority on homosexuality, gays themselves, liars. Second, there was a problem that if homosexuality is a choice, then so should heterosexuality be a choice. The straight opponents refused to accept this. Now, opponents deny claims of bigotry with their “hate the sin, not the sinner” rhetoric. Denying a person rights and branding them immoral for who they fundamentally are is the definition of bigotry, but focusing their intolerance on the one action that separates the gays from the breeders (that is, homosexual sex) is a loophole in the bigotry label--at least in their eyes.
This loophole is many things, but internally consistent isn’t one of them. Since the only way to see gay sex as immoral is by appealing to Abrahamic religious traditions, then we should measure their entire argument by the same standard. The bible repeatedly states that sins of the heart and mind are just as damning as sinful actions. Hell, it’s even in the commandments. Thou shalt not covet is an entirely separate command from thou shalt not steal. When using the bible as their guide, the unavoidable and internal homosexual attraction is just as sinful as the active and external homosexual sex act. Therefore, it is safe to conclude that gay marriage opponents are, in fact, bigots.