throughout history, religion of all kinds have made the common people into ding bats. Christianity had a lot of support from common people, and they supported and believed in all the above attrocities. There were exceptions, but for many, the church led group thought.

and why shouldnt it? the bible condones all of the attrocities. death for heathens, fire for witches/shamans/soothsayers, witchdoctors/prophets, curses upon other races, slavery, genocide and ethnic cleansing.

islam is a younger religion and is still in its super crazy mode. christianity has softened up a bit in the last years.