Wow... 14 pages in three hours! I'll try to jump in here...
1. Homosexuality is neither normal nor natural. You don't need a complex scientific theory to understand this - you just need a basic anatomy lesson. Men are made for women, and women are made for men. It's not that hard.
2. Gay marriage "normalizes" something that is not normal. That is what people are so upset about. We, as a society, do not want to say that homosexuality is a normal behavior, because it isn't. That's why the majority of Americans are opposed to gay marriage.
3. Someone (I think acludem) said that this just goes to show how the right "hates gays." While unfortunately that is true for some, not everyone on the Right hates gays. Opposing behavior does not equate to hate.