The thread name change is possibly to get us away from the debating of whether or not homosexuality is a choice for most. Kind of like if Person A says it is, Person B is gay and knows it's not, Person A reiterates a slightly different way that it is, Person B keeps saying it's not, and who better than someone gay to know that, anyway? Person C trolls, and no one listens to anyone else's points, no matter where they fall on the scale of validity or not.
Let's do this:
Citing social (and not religious) points, even if homosexuality was a choice, what purpose does denying us the equality of marriage serve, anyway? Is there a valid, nonreligious reason to deny marriage equality?
I don't want to hear tradition, because Greeks and Romans accepted homosexuality as norm. Same-sex, well, sex, was not untraditional or in general seen as bad by the public as a whole.
I don't want to hear "sactity of marriage", either, because, by that logic, divorce should be illegal.
I don't want to hear fallacies like the slippery slope.
I don't want ad hominem, because that answers nothing.
I don't want to hear that it changes marriage for everyone, because most would agree that interracial marriage, which changed the way marriage was seen, is a very positive advancement for society and marriage, as a whole.
Lastly, the children argument holds no water. I have yet to see a study that shows that gay couples cannot raise children as well as straight, nuclear households, not to mention single-parent families. And if marriage was just for children, that means contraception should be illegal, and if a married couple does not have one or more children in their care, a divorce is legally mandated.