The "god" of this movie is one whom deserves neither worship nor respect
SPOILER
Since we're told in the end that Dad and Adam were right, and Fenton was wrong (and was all along a demon), UNLESS we dismiss all the events told by Adam (unreliable narrator):
- Fenton was turned into a monster by Dad (self-fulfilling prophecy)
- Whatever "deity" that commands the torture of kids to turn them into monsters to then have his followers kill them (but only after they already racked up a body count) is a demon, plain and simple.
Remember how the road to hell is paved by good intentions.
So if good intentions take you to Hell, where do bad intentions take you to? OZ...