I agree that people tend to shield themselves from opposing views, and perhaps faith plays some part in that, but I think what you're describing has more to do with Benford's Law of Controversy, which says "when we find ourselves with little actual data and understanding, we fill in the gaps with passion and emotion."

I think this has more to do with the human psychological condition, defense mechanisms, etc... I could be convinced that there's some interplay with faith, but I would argue that healthy faith removes the shield/defenses in a lot of ways, as it can allow us to be more comfortable with things that are uncertain.