Luckily western society tends to be more secular, but the government that, say, ISIS is setting up, is not like this. Christians here in America would like to have a government like that, where unbelievers are imprisoned or executed. Christians in the middle ages were exactly like this.
I spend a lot of time around Christians, both conservative and liberal. I have literally never heard a single Christian articulate anything like a desire to have unbelievers imprisoned and/or executed. Nothing even close to that.