First of all. Thank you so much for refusing to fight against strawman arguments and putting forward what people actually believe. It's much more productive, and interesting to talk about. I hate religion and I hate their stupid arguments, but I wish that criticisms would focus on the stupid arguments they actually make, instead of stupid arguments they don't make.
On the marriage front, and I know it's not your beliefs I'm rebutting here, that argument has always especially bothered me. Because it's like. Yes, actually, I do think gay marriage is nonsensical. Marriage is indeed a religious concept, and all of the religions that promote it condemn homosexuality. I hate marriage in general and wish nobody would get married. Yet it still happens, why? Why do gay people even care about being married then?
Primarily, it's because the Christians forced their religious construct to become so intertwined with legal and financial benefits that are otherwise unobtainable, that you put yourself at an objective disadvantage as a couple, economically, medically, legally, if you do not get married. The problem is that once marriage passed from the religious conceptual realm where it gestated, and into the political sphere, it should have become a separate, secular concept under the idea of separation of church and state. But of course the Christians can't accept that kind of compromise either. They want to have it all, all, all. So if Christians didn't want gay people to want to get married, then they shouldn't have enshrined their religious concept unfairly above others in the governmental system. Whoever sows sparingly will also reap sparingly, motherfuckers.