Not much to it really. The “mystery” didn’t develop much, there wasn’t a sense of suspense, the “mystery solving” sequences didn’t solve much, the acting wasn’t good, there wasn’t any sense of evil on the satanism.
Really blah. A waste of time for real horror fans, IMHO.
Liked Hereditary, disliked Midsommar, FWIW.
My feeling was that if it’s named after the guy then he ought to be terrifying. Somebody specific had to be in threat, not just humanity at large.
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Then when you bring Satan into it, you’re swinging for the fences. The biggest bad has to scare the pants off you and outperform every human.