I don't have a problem respecting someone's religious beliefs. The problem is when they use those beliefs to try and dictate what others can and cannot do. Once they do that they are fair game.
Also, too many of them say horrible things about others and then start crying persecution and free speech when someone goes after them.

^^^ that and the fact that every christian without exception fails to live up to their own ideology in some way or (usually) many ways, yet somehow some of them have the time and the need to single out and chastise other people over the "sin" of homosexuality which jesus never even felt the need to reference in the bible's new testament. there is no reason to respect such ridiculously random hypocrisy. done and done.
Larry Gaylord: "a billion people come in on a day off, and they don't flip out!"

Christians don't see their viewpoint as an opinion, they see it as fact. That is why people become so irritated with religious people in general.

Where's the code for heterosexuality?

Homosexuality is a choice. Why haven't they yet to show a genetic code???

however, when people who are Christian try to express their opinions, they are pummeled with accusations of being intolerant and accepting, therefore a lot of them (weeds) are plucked.
Yeah, that tends to happen when you start demonizing an entire group of people who have absolutely no control over the way they are. It would be like saying redheads are immoral, and talking about the 'redhead lifestyle'.

Political correctness is tyranny with manners.

You say that like it's a bad thing

you are obviously more comfortable in 1955

You just described political correctness in 2015.