And yet from the time it achieved the kind of power in any society from which to exert substantial influence well into the modern period, Christians were killing people -- in other countries, in their own countries, etc. -- in the name of Christ all the time. The Crusades (and not just the ones in the "Holy Land" and/or targeting Muslims) were a thing. The Inquisition was a thing. Europe's Wars of Religion were a thing. There is a reason the word "pogrom" exists.
The modern Western concept of freedom of religion isn't a direct product of some religious parallel to the Ruby's community's maxim "Matz Is Nice And So We Are Nice", its a product of the exhaustion of Western European Christians after more than a millenium of killings -- not least of all of Western European Christians by Western European Christians -- in the name of Christ.
The idea that Christianity is somehow inherently more peaceful than Islam requires ignoring pretty much the entirety of the history of Christianity.
Any muslim who kills a satirist who mocked islam has pretty good grounds to be saying that their actions are in line with what Mohammed would have done!
I think underestimates the influence of the founders. Jesus mostly preached to turn the other cheek and didn't kill anyone.
Here is a list of people killed by Muhammed http://wikiislam.net/wiki/List_of_Killings_Ordered_or_Suppor...
It goes on a bit and the sources vary in their authority but overall impression is pretty pro violence.
Most of the 911 guys were well off Saudis who felt they were following the teachings. Obviously you can interpret the founders of a religion in different way and most Muslims are peaceful but it's hard to understand what's going on if you ignore that stuff.