The fact that he does not trust doctors influences him to search for help with an exorcist and reveals the true magnitude of the problem.

As a parable, the Last Exorcism is meant to have people understand the importance of remaining faithful regardless of the problems that they come across. Furthermore, the film is also intended to influence viewers to consider that the power of God enough to help them in any situation regardless of its gravity, taking into account Marcus' attitude in the face of an enemy that was visibly much powerful than him.

Even with the fact that she is hesitant about being a part of the cult, Nell appears to be willing to perform acts that would benefit the sect as a whole. Her tendency to put Marcus on a wrong track demonstrates that she does not actually want to negatively affect the cult. Her relationship with...
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