Originally posted by TrashMan
what so wrong with having a 100% christianic country? Or islamic? or jewish one for that matter?
Bluntly, the religion itself. It works for people willing to totally abide by the religion. But if someone doesn't abide by the religion, there's no method of changing it because by doing so you'd be perverting the religion itself from its original vision. So that person, or those people, more likely, must suffer persecution for their entire lives, or sacrifice their individuality for a semi-peaceful existence.
Having a non-religious government serves as a buffer zone of a sort; you can enact laws that most everyone agrees on, and as long as people have enough freedom, they can impose whatever restrictions on themselves that they like, while still allowing for individuals or groups of individuals who disagree with the main group to live their lives without total persecution. They might suffer some pointed glances every day, as they go to the supermarket with their seven wives and four husbands

, but they probably won't have to live in constant fear of stonings.
Plus, laws can be changed and people can disagree with them while still sticking with their religion.