A pretty tasteless documentary, in which not much new information is learnt, and half the runtime is taken away by some "spiritual investigator" on the level of a TLC relaity show. It's main angle is to blame Dawn, sister of R. DeFeo with "whatever sticks" mentality in the first half. The second half is probably about the Lutz family.
imdb confirmation link: https://www.imdb.com/title/tt1762235/?ref_=nv_sr_srsg_0