History is often not agreed upon. A lot depends upon whom you read.

Over the years if you add up the Crusades, Auto-de-fes, religious wars (even being fought now), troubles in Ireland, Israel and the Palestinians, the purge by the Catholic Church over the Knights Templar, British history regarding Elizabeth and Mary Queen of Scots, the Holocaust (a religious war), the use of religion to encourage slavery in the American South,
the rise of the K.K.K. (with the burning cross), and religious wars over every period of history (there has never been peace among religions), they eclipse Mao, Stalin and Pol Pot
atrocities. Don't forget that Hirohito was into a form of Shintoism. Every war has had a religious component. Remember the Anti-Communist Christian Crusade?

Religious misinformation is a staple of propaganda to salve the guilty consciences
of the so-called "believers".