Nefarious sells itself as a demonic-possession horror thriller. However, like Kirk Cameron’s Saving Christmas presenting as a family comedy, only to reveal itself as a two-person sermon on evangelical Christianity, so is Nefarious. Thou shall not bear false witness and all …

Serial killer Edward Wayne Brady (Sean Patrick Flanery, Saw 3D) is hours away from a blind date with the electric chair. Arriving at the prison, Dr. Martin (Jordan Belfi, Surrogates) is assigned to give Brady a psych evaluation, because the law states if he is insane, he cannot be executed. Seems like a big ol’ box that could’ve been checked anytime before the felon’s last day on earth, but just go with it.

Right away, Brady tells “ignorant sack of meat” Dr. Martin four incredibly bonkers things:
1. He wants to be executed.
2. But he can’t be killed.
3. Because he’s the devil.
4. Furthermore, the doc will commit three murders before the night’s through.

That’s a terrific setup, full of story possibilities. Instead, Brady and Martin sit and debate theology for an hour, with only the occasional potty, phone and/or smoke break for the doc. Brady not only works at convincing Martin of supernatural evil, but tries to get Martin to let the satanic spirit inhabit him and write the “dark gospel.” Their elongated conversation entails the kind of philosophical blabbering and muddy analogies one witnesses through clips of fundamentalist preachers at the pulpit or from the mentally ill on street corners, both using a ton of words to talk ’round and ’round the same circle.

I bear no built-in opposition to faith-based films … when they function as a movie first and impart a lesson second. Good examples of this can be found in the feature adaptations of Ted Dekker’s House and Thr3e (not to mention Dekker’s novels themselves). His stories are constructed with propulsive suspense, and viewers leave with a clear understanding of his message and beliefs without feeling like their head was held under bathwater by someone shouting demands for their repentance. (Another? William Friedkin’s The Exorcist. No, really.)

Shot in Oklahoma, Nefarious comes from Chuck Konzelman and Cary Solomon, who have found box-office riches with God’s Not Dead, God’s Not Dead 2, God’s Not Dead: We the People and — eventually, I presume — Are You There, Margaret? It’s Me, God, Still Not Dead. While I haven’t seen any of those, I can say Nefarious’ preaching-to-the-choir moralizing struck me in an off-putting way I couldn’t put my finger on. Afterward (via Google, as the screener had no credits), I understood why: It’s based on a book by Steve Deace, the conservative talk show host, college dropout and election denier who rallies against “COVID-19 tyranny” and pronouns — the kind of hateful, ignorant, boogeyman politics that unfortunately seep into “the church” these days.

Speaking of fire and brimstone, Flanery admirably devotes his blinking, twitchy, stammering all to his performance. While he obviously has the showier part, he wipes the acting floor with Belfi, who at times seems to be impersonating Ben Stiller impersonating Tom Cruise, but seriously. Rounding out the cast is Deace’s boss, inflammatory, fact-bending conspiracy theorist Glenn Beck, playing himself. Judging from Beck’s extended, last-scene cameo to essentially plug Deace’s novel, the sartorial choices of multishirted serpent Steve Bannon have rubbed off on him, because I counted no fewer than four layers covering his torso. —Rod Lott

Opens in theaters April 14.