Actually, Communities were ATHEISTS are predominant have less homicides than religious communities, the majority of the UNITED STATES are religious, only a tiny fraction are atheists. It is RELIGIOUS Communities that are the MOST violent.
Statistics, performed by Gallup Media, some years ago, clearly show that in US jails, absolute majority of people refer themselve as "religious", mostly - christian/catholics (well, it's west, that's expected), while just a fraction considers themselves - atheists.
By these same statistics - 93% of members of National Science Academy of US are atheists, 7% - agnostics (and maybe a tiny fraction among these - somewhat religious and "believers").
More statistics: AN interesting correlation: the higher the average IQ of a country, the less people who believe in God, and vice versa (talk Africa).
I could continue, but basically what I wanted to say - before using a word ATHEIST - at least find the fukk out what does that mean.