I think those were evil people doing evil things. Who calls the people who perpetrated these things "Christians"? If I am king, and direct my armies to slaughter another country's people because "<anything> cannot be tolerated by us, the Christians"....then I am a liar, and masquerading as something I am not. The people that did these things wanted to do them for one or more reasons, and none of those were because God told them to, or Christianity demanded it of them.