No, if you are willing to kill over that, you'll just find something in the place of religion. If any of you seriously believe in the equasion 'no religion = no war' you haven't a clue about the human race. The causes go far deeper.
What causes war is people are out for gain or revenge or any number of things.
People like that I say aren't truly religious but using it as a pretext. Remove that and they will find something else.