I'm not sure how you make a documentary series about exorcism that ends up this dull. Although it does not seem truthful. I have seen documentaries about the history and belief of exorcism and there are a couple facts that don't line up with this show. First off exorcism is very rare in the modern world especially in the modern U. S. Yet this show makes it seem so common. An exorcism can only be preformed by an exorcist, it is special training separate from any and all other training in the Catholic church. Yet when you watch the show they are listed as pastor or bishop but none are listed as exorcist, IMDB has them listed as actor and when you go into the profile it says they have been acting for the past 20 years or however long they have been doing it. So none are actual exorcists and even if the claim is they were reading off actual files from real exorcists it's doubtful because they never got permission. An exorcism cannot be performed unless you receive authorization from the Catholic Church and I believe that authorization comes from the Vatican not your local church either way none of the stories mention contacting the Catholic Church for approval before performing an exorcism.
Even if it is all true how the stories are told is just dull, slow and mostly boring.