Millions of people have been killed because they believed in the wrong magic god fairy.

A comment written by a Jew at the Wall Street Journal:

I have never commented critically, as a Jew, with respect to their "beliefs" and doctrines---which are numberless, and which have been used in the service of great acts of charity and compassion---and to justify the persecution, enslavement, forced conversion and mass murder of nearly every people Christians have encountered.