And Christianity gave us Hitler, the crusades, and burning "witches" (aka educated women), and the Muslims gave us 9/11 and jihads. No one is going to win in a measuring contest, and that would be missing the point anyway.
I'm not sure about the Western heresies (RCs, Protestants and such), but I can assure you that Orthodox Christianity did not give
anyone Hitler. At worst, a terrifically distorted and twisted version of Christianity might have incubated his opinions. See references to Hitler's ideas about an "Aryan Christ" -
http://en.wikipedia.org/wiki/Hitler_religion. I'm pretty sure however, that most people, if they think He existed, was actually Jewish. I'm pretty sure that's a little detail that any sort of Nazified Christianity would have to go to great lengths to dance around.
Again, the Orthodox Christians were generally
victims of the Crusades, rather than perpetrators - see the sacking of Constantinople for that one. Historically, the burning of witches was done by
secular courts rather than ecclesiastical ones. Heaven know's why I'm defending the Inquisition on this point, but, in the actual history of Rome's Inquisitions, as opposed to popular assumptions, they tended towards leniency with regards to witchcraft accusations, in stark contrast to the secular courts of the day. IIRC, only four people were convicted of witchcraft by the Inquisition over the hundreds of years of it's existence (I could be wrong about the number, but I'm pretty sure it's under a half dozen).
If anything Orthodox Christianity can be accused of, it would be giving us Stalin. Good old Joseph, in his youth was educated in an Orthodox seminary. Legend has it, while in Seminary, ol' Joe was serving as an acolyte (grown up version of an altar boy) and did something wrong during the service. According to the story, the Bishop who was officiating slapped him across the face for it. He apparently then and there silently vowed his revenge on the Church. History shows that he got that in spades. Moral of the story: don't smack altar boys.

Actually, what I am assuming (and the whole point for posting the study) is that tolerance is a better moral practice than intolerance, and since various religions argue that they offer "moral truth," they ought to back that claim up with things like tolerance...
I'm not arguing with you, as I most certainly agree that tolerance is preferable to intolerance. However, tolerance is not a Christian virtue. Love is. They're not
quite the same thing. You can tolerate someone all the while not loving, or even trusting, them.
But since you asked, something about "love thy neighbour as thyself" is in there somewhere...
Love and trust are not synonyms.
Interestingly, I often find myself sympathetic towards atheists, even if I don't agree with them. Quite often their reasons for rejecting Christianity are the exact same reasons I rejected
Western Christianity. Of course, some have a hard time understanding that not all Christians believe in a God that "so loved the world that He sent His only-begotten son so He could torture Him to death in a most horrific fashion, which was an activity that put Him in a mood to be a teensy bit more forgiving towards everyone else."
