Atheists like to criticize religion and religious people by bringing up all the wars and killings throughout history that have been perpetrated in the name of God, Allah, Baal, Jupiter, etc. As Christians we can look back on our proud past of the Crusades, the Counter-Reformation, the Troubles, abortion clinic bombings, the Conquistadors, and many others.
I say to the enlightened atheist - wait.
You'll get your turn.
Despite the millions who were killed in the Soviet Union, China, and Cambodia by atheist regimes, your body count will rise.
Atheists just haven't been around as long as believers.