Areligious leader who attempts to overcome his hidden doubts with intense expressions of spiritual certainty illustrates most clearly the defense mechanism of

The answer is that it illustrates most clearly the defense mechanism of reaction formation.
Reaction Formation happens when a man wants to do or say something and afterward really does or says something that is viably the opposite they truly need.A reason for Reaction Formation is the point at which a man looks to conceal something unsatisfactory by embracing an inverse position.

The correct answer is "  it was believed that the dispute emerged in 632 just after the death of the prophet muhammad."