I believe this is a fundamental issue with the world today (and in the past). Many who are so convinced of their beliefs that they leave no room for doubt. This lesson is not only pertinent to religious beliefs, but ALL beliefs that matter to us (politics, science, ethics, morality, etc.). I also find it interesting that science is built to actively combat doubtless conviction. It seems that many religions for that matter are also built to do the same, but those trusted with interpreting the fundamental writings of the religions (i.e. have the power) preach a version in which you MUST have conviction (not faith/doubt) or else. Politics suffer from the same issue, but it is even less structured and the interpretation is adversely effected by the 24 hour news cycle and the endless search for ratings (i.e. profit).