Just because you walk into a church does not mean everyone you encounter will behave in a Christian manner. The devil likes to sow discord and to stir up rivalries, and the walls of a parish building won't stop him from coming inside. Narcissistic bullies are found in the pews, just as they are found in everywhere else.
Yet, in a group setting, they never work alone. They like to tag team their target by recruiting others who may not have a strong character, or may not be deeply grounded in their faith. Many people familiar with personality disorders refer to these co-bullies as flying monkeys. I also covered this topic on my Female Bullies blog, which discusses the apparent epidemic of female malignant narcissists.
Flickr photo by Mr Moss