A quick trip to apple.com reveals the movie to me.
It looks somewhat Lovecraft inspired, but nothing like Eternal Darkness, or any of the other stories based in its universe. Lovecraft was much like Poe, in that sanity and reality were both twisted in their stories. The Order doesn't contain any of that. It's just about a corrupt faction of the church abusing dark powers. (Like I'm supposed to be shocked and surprised?)