The answer I would give is no. Fanaticism isn't the problem; it's the object of your fanaticism that creates the problem. As I stated in my sermon, Have you ever met an Amish terrorist? Of course not. Yet the Amish are some of the most fanatical people in the world; they're just fanatical about following Jesus, specifically, letting Christ's love and grace shape the way they relate to others.
With that in mind, I call everyone to be a fanatical follower of Jesus. Listen carefully to that sentence. I don't want you to be fanatical about a principle, or a doctrine, or an agenda, or a particular church, or a particular way of worship. These little "issues" that each person holds dear in his or her heart are annoying at best and divisive at worst. All of these things are necessary, but they are necessary for only one purpose--helping us learn to live and love like Jesus lived and love. Giving yourself to love, to be loved and to love, is the best thing you can do with your life. Anything less than that is not worth our devotion.
Again, please think about what I'm saying. I'm saying, let's allow Christ to inhabit us--his love and grace. Is there any better way to live? I can't think of one. I'm ready to fanatically follow this one who has fanatically followed me.
May God raise up an army of grace-filled, love inspired Christians.
Peace.