What is the author's style in The Demonologist: The Extraordinary Career of Ed and Lorraine Warren by Gerald Brittle?

The narrative is in both the third person, and in the first person as it switches between narrative of the author and the stories, as told by Ed or Lorraine Warren. As a narrator, Gerald Brittle is seemingly distant, often only writing his questions to the Warrens and allowing their words to tell the entire story. On occasion, however, Brittle shows a distinct religious undertone that is difficult to deny, making his credibility somewhat questionable, considering the subject matter. The Warren's, too, show a bias toward religious explanations for events, again somewhat biasing the storyline and the philosophies behind the spiritual realm toward religion.