"Believers" far more often have murdered other believers (whose belief differs in some way from their own) than they have murdered atheists. Catholics murder Protestants, and vice versa. Sunnis murder Shiites. Jews and Muslims murder one another. The slaughter of believers BY believers is far more common than the slaughter of atheists by believers.

As for the slaughter of believers by atheists!!!...just go to grotesque examples of that like Mao's China, Stalin's Russia, and Pol Pot's Cambodia, and the numbers of believers slain by the official atheists in power goes into the millions.

No one has a monopoly on either virtue or victimhood when it comes to this subject, neither the believers nor the atheists. Both are capable of good works, bad works, and terrible atrocities.