Is it true that atheism has killed more people then organized religion?...

[chatpilot]

Existentialist wrote: 'I can't think of any religion that ever taught people to kill just because the religion said so.

I disagree slightly with this statement, although the crusades were generally a bid for power and the propagation of their religious beliefs the church did promise those that participated redemption for their sins as a reward for killing all infidels, namely the Muslims and in some cases even some of the Jewish settlements were attacked. Religion was used as a catalyst to violence. For example during the first crusade Pope Urban the 2nd said these words:" Christians, hasten to help your brothers in the East, for they are being attacked. Arm for the rescue of Jerusalem under your captain Christ. Wear his cross as your badge. If you are killed your sins will be pardoned."

Religion has been used effectively throughout history as a means to an ends and has made what would probably have been decent people into murdering animals who believed that their faith justified their cruelty.