Now, granted I don't know a lot of atheists in meatspace, nor do I spend much time listening to the internet atheist community outside of this forum, but I've never come across an atheist that was afraid to criticize a religion, except maybe Islam in a public setting(some people just like having their heads attached to their necks).
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell