The riots are a result of ignorance and intolerance, two attributes that fundamentalist Christianity displays in abundance.
The Muslim world was the center of peace, tolerance, and education back when European Christians were living in the ignorant, superstitious Middle Ages, don't forget.
We are already seeing a great deal of Fundamentalist Christian-based erosion of educational standards and we have begun to pay for it, as now the US ranks something like 28th in the world in the production of professional scientists.
In the US, more people believe in Astology, Psychics, and Noah's Ark than understand the basic concepts of any science.
If randman and you had your way and the entire United States became a Fundamentalist Christian Theocracy, it wouldn't be long before we would have people rioting over some silly religious belief.