Twelfth Annual FMS Scarelicious October Movie Series: #6 We Summon the Darkness

It's 1988.  Heavy metal rock music is, to the Christian moral majority, the work of Satan: satanic panic was real, y'all.  In We Summon the Darkness, across the country, eighteen people have been murdered by satanists, which you can tell from all the candles and pentagrams at the crime scenes.  The authorities can't figure it out but they're sure that heavy metal music is to blame.  Meanwhile, in the heartland, three girls - Alexis, Val and Beverly - are on their way to a heavy metal rock show.  They pick up three dudes in a sketchy van and, after the show, continue the party at Alexis's dad's McMansion.

Here's the twist HERE'S THE SPOILER WHICH I'M NOT SORRY ABOUT BECAUSE I THOUGHT THIS MOVIE SUCKED:

The guys are basically good dudes and it's the girls who are out to kill the guys AND they're not doing it because they're satanists - they're doing it because they're holy rollers who are trying to blame satanists and drive the fearful faithful to Alexis's dad's conservative mega-church.  The murders all across the country have all been committed by her dad's congregation.  (Alexis's dad, by the way, is played by Johnny Knoxville who isn't that good an actor.)  Beverly gets cold feet, however, being a recent recruit who isn't entirely onboard with the church, and ends up trying to help the remaining two boys after Alexis stabs the first one.  Bodies start to pile up - including Alexis's coke-head stepmom who just stopped by to pick up her stash, interrupting the attempted murders; and a sheriff - and at one point, Bev is using an outboard motor as a weapon.

I found this flick deeply unsatisfying.  I usually enjoy it when a horror movie goes off the rails in the final third but this one was just confusing.  It seemed like something got cut that would have clarified Bev's motivation.  Why crank Belinda Carlisle's Heaven and then immediately have the power go out?  That motor would have been waaaaaay too heavy for Bev to be toting around.  Why not take the van keys out of dead Ivan's pocket?  Things totally shifted into WTFdom and my last note reads: "Dear A.V. Club: this movie is stupid."