Columbine is the ONE
legitimate example given so far of atheists of killing christians SPECIFICALLY
for not renouncing their religion. I am an atheist, and I remember my shock and horror as one survivor told of them mercilessly killing a girl who would not say she did not believe in god.
You have one good example, and it is a true example of atheist terrorism. I give you that. But it is two high school kids on a shooting rampage using their christian parent's guns. Hardly the Crusades. Hardly Al Qaeda. Hardly the Spanish Inquisition. Hardly the Thuggees. But it is one true example of atheist terrorism.+Carlos Vazquez
Now let's deal with Stalin and Mao. They were merciless toward evangelists
, those who proselytized for their faith. They didn't care much what you believed in the privacy of your hovel, as long as you spouted the party line in public. This truly wasn't about religion, as many atheist scholars and artists discovered to their sorrow during Mao's "Cultural Revolution". Insofar as religious people did not contradict the state, they were grudgingly tolerated.+Gustavo Andres Herrera
As for Hitler, he was a Catholic. He appealed to religious fervor quite often. His military units used religious slogans. He and the Nazi party were by no means atheist.
His hatred of the Jews was ethic, racial, not religious, as shown by the fact that he often dumped loyal Nazis in concentration camps when it was discovered that they had jewish ancestry as small as one-sixteenth.