Religion should be abandoned because it motivates killing—argue atheists. But the first problem with this argument is that “religion” is a notoriously slippery term. It is therefore impossible to rationally categorize God-believing church attenders as “religious” and atheists as “non-religious.”
Secondly, the most prolific killers in all of human history were the Communists and Nazis. Communism is an officially atheist political philosophy, and the Nazis rationalized their killing with atheist philosophy.