Does the World Need Religion?

[Cephus]

Now demonstrate that those atrocities were committed for atheistic reasons. Then we'll talk about atrocities by religious people for religious reasons.

I know atrocities happen in the name of religion but what I am saying is that more atrocities happened by people who were atheists.

Who cares?  You're confusing correlation with causation.  If atheism is not responsible for the atrocities, then the fact that they were atheists is irrelevant.  And you are simply wrong.  More atrocities are committed by the religious, simply because there are more religious people.  And of those things, a lot of them are caused by the religion, by the atrocity commiters own admission.