TEC and Psac, I just realized I was kinda vague in my question....
Psac, you don't believe Islam is the true faith, correct? So regardless of whether a Muslim chooses to be a peaceful moderate or a radical terrorist, the Koran is just a book, right? No divine inspiration or message there? I thought that was a given but if I'm wrong, feel free to correct me.
I'm talking about a Muslim identifying flaws in his reasoning that lead him to realize he just accepted the most prominent religion in his childhood environment and that Islam and the Koran are the product of man, not god.
The point I wanted to make is that critical thinking would be his ally; stripping back presupposition and bias. If he doesn't do that FIRST, then questioning his cherished beliefs will only lead to bias confirmation and he'll think he's proven his faith to himself. It has to be introspective and he has to analyze his thinking. Would you agree?