The two core principles of Conservatism, of which Christian Fundamentalism is a part:
I get to do what I want.
You have to do what I say.
In the Religious Conservative’s mind, free speech means they get to say whatever they want about whomever they want (I get to do what I want). At the same time, free speech limitations suddenly apply when you have anything critical to say about their religion (you have to do what I say).