Is Atheism the cure for violence and intolerance pursued in the name of Religion?

Imagine that all violent and intolerant followers of religion were suddenly transformed into Atheists. The Jihadist, the Bible Thumper… What if they suddenly transformed into Atheists? Would they have any basis for expressing their special brand of violence and intolerance?

Also, would a miraculous conversion to Atheism prevent ethnic violence and intolerance, or would that type of violence continue to plague humanity regardless of belief in a deity? Is racism a religious problem, or would racism still exist even if religion died?