Any five to ten minute excerpt from this movie could easily lead a viewer to conclude that this is a well made horror or suspense thriller. The production values are high, the performances good, and so on.
The problem is that the parts of the film don't fit together. The sequence of action has the usual slow build and accelerating pace of any good thriller, but while the set-up is promising, and the events proceed logically enough as interesting and sympathetic characters are frightened, threatened or killed off, the reasons underlying the events remain obscure.
Hints and suggestive exposition are introduced, and then forgotten. There are explicit references to religious-themed horror fantasy, speculative science, and even a few elements of a possible conspiracy. An elaborate backstory is gradually revealed, and then abruptly dismissed. The conclusion doesn't really conclude anything: there's a decisive ending, but no resolution, no revelation, not even a clear idea of the probable consequences.
It's possible a re-edit could address these issues and make it a decent film. As it stands, though, it just doesn't work.