The mob that would die for a belief seldom hesitates to inflict death upon any opposing heretical group.
Ellen Glasgow
From The Great Thoughts (link is to the 2nd Edition, mine is the 1st Edition–1985)
[The people on both sides of the current political battles would do well to keep this in mind.–Joe]
Apparently she never heard of Christianity. 11 of the 12 disciples died as martyrs for their cause. The 12th committed suicide in shame for his actions. None are recorded as having killed any one.
Peter was the closest to a killer, he cut off an ear with a sword. Jesus promptly put it back on and rebuked Peter, before they led him off and killed him for his cause.