Some of the world's most evil people were atheist and had no religious beliefs. One being Mao Zedong.
That's not the point. There are good atheists and there are bad atheists. There are good religious people and there are bad religious people.
However, people don't do bad things in the name of atheism, which is essentially a belief without content. It simply means a lack of belief in deities.
But people do bad things in the name of religion. There is a logical path from religion to, for example, 9/11. You can't say the same for atheism.
I honestly don't know why people find that point so difficult to grasp.