*Spoiler* I just saw the movie
I just saw the movie in a sneak preview. It is not really found footage. There are some found footage shots but just to make it seem like the people at the vatican are seeing it that way.
The movie was not really good. It had 3-4 bad jump scares and was rushed towards the end. It had some unintensional funny scenes in it that made it at least for me somehow entertaining.
I would not look forward to this as a new good horror movie.