https://media.scored.co/post/3h4P9fXapTzx.png
Almost all critics are trying to bury this movie because it is right-wing and Christian (all the other left-wing anti-Christian movies were never a problem though).
The movie is a cheap production, all the major plot revolves around two guys chatting in a room, but the dialog is really well written and both actors are doing a great performance.
It is also very different from modern horror movies, it does not contain jumpscares and shaky cameras. It would probably be better classified as a psychological thriller.
Even if you are not religious but have some interest in Christian lore you will probably enjoy it.
I think the movie is based on thomistic interpretation of Lucifer's revolt wich is very interesting, but some protestants may not find it completely "biblical." Some calvinists may even disagree entirely.