We have our own set of beliefs and each religion has its own doctrinal statements to abide. We have a deity that we believe in and each religion has its own set of doctrines to follow. When a person fears the prospect of challenging the doctrine of their belief system they are said to suffer from Heresyphobia or Hereiophobia. This fear suggests that any deviation from the doctrine can result not only in excommunication from the church but even eternity in hell.
This is rooted in childhood since parents can make their children believe that the doctrine is unblemished and true and that deviation from it can result in the wrath of god. The more fervent the belief in the doctrine the more fearful one can become about the potential that the belief system could alter according to the will and whim of those who disagree with the original doctrine.
One of the most predominant symptom of Heresyphobia is a panic attack especially when it is suggested by some that the doctrine should be changed. For this individual it may be like assigning new terms to an existing contract without permission from the other party.
This fear can be a little bit more difficult to manage because it wrestles with faith. A therapist can help you in this aspect.