Violence is the Natural conclusion of Religion.

[Smaug]

I wouldn't say that violence necessary originates from religion in general. Common believers tend to be more or less inert even in spite of the fact that the scriptures may contain direct calls for violence. They just don't have enough time or motivation to go into details. Normal religious philosophers and priests try to cherry-pick the texts to avoid tension. This depends on the religion and denomination of course. Usually it's the fundies who are violent. Speaking of fundies, they must be such a sort of people who are prone to antogonization and extremities no matter what guise they use. Religion just happens to be very convenient for fulfilling their urges.