Pure Brutality

[Sheldon]

 When you are into some genuine form of spirituality. You end up distinguishing ego centered behavior better than other ordinary people.

That looks like a no true Scotsman fallacy to me. I can see how blindly following religious ideologies that have archaic and pernicious doctrine and dogma, can lead directly to acts of cruelty barbarity and indifference to suffering. 

Now while I can see that someone who does not believe in any deity, is just as capable of being cruel, barbarous and indifferent to suffering, atheism itself has no ideology or doctrine that must be followed, so it would follow that this is simply a personal choice. amd nothing directly to do with atheism.

I doubt that Peter Sutcliffe or Ted Bundy believed in mermaids or unicorns, but no one would dream of suggesting this lack of belief motivated their terrible crimes.