This is a topic that interests me a great deal. There was a thread on Andrew Sullivan’s blog that I found intriguing. It was prompted by Pope Benedict’s recension of the prior excommunication of a schismatic bishop. (More posts on the current situation coming up.)  Any reasonable person would call this bishop a holocaust denier. But that part is an aside. The substance of the post is about faith and doubt. Sullivan writes:

… the internal wrestling never ends. The search for truth must always be first; and religion is nothing if it is not true. Which is why doubt can never be a danger. Banishing doubt is the danger.