The state, versus the church?

From time to time, situations come up that make us wonder if the whole idea of church and state should permanently be renamed, state versus the church. It seems that nine times out of ten, this imaginary line gets crossed and Christians are left with their hands raised, wondering what they did wrong. Somehow, the "state" has become line monitor and Christian's are left only defending. So why? Why are people so sensitive to our faith? Why is it appropriate to make fun of our faith but not those of other religions like Catholicism and Muslims?