If you're thinking of the mini series adaption of Spoiler: Steven King's It, then I've already seen it and yeah it creeped the hell out of me. On the other hand it was surprisingly good. Although technically a spider isn't an insect I guess.
Actually, it was very important for author William Peter Blatty that the person who directed the film version of The Exorcist be objective and agnostic on the subject, not necessarily a believer, the better to ensure that the results would be more credible. (BTW, director William Friedkin happens to be Jewish and not a Catholic.) I think that the objectivity that Friedkin brings to the film contributes to the film's disturbing nature. I honestly didn't get the feeling from The Exorcist that anybody was really trying to "scare people back to church" (although I can certainly imagine that as a side-effect!) In Friedkin's own words, The Exorcist is a story about inexplicable events. And God (or who/whatever) only knows that life is full of them...
^That's not what I've read. I can't speak for Friedkin, but Blatty's intentions were clear, and have been fully explored by film historians. IMO, if Friedkin truly thought he was making a film about "inexplicable events," he was kidding himself.
I laughed out loud for a good 15 minutes when I first saw The Exorcist back in 2003 when the 'crucifix scene' played. How did that movie ever scare anyone? I saw Ghost Story not too long ago. It bored the Hell out of me. Seeing Alice Krige buck naked and fooling around was pretty nice, though. It, Killer Klowns from Outer Space (a lost classic, IMO), Them, perhaps a few others.
Ghost and slasher flicks put me to sleep. And I don't even bother with religious horror. Lovecraftian horror is really about the only thing that does anything for me. So I'm pretty much left out in the cold. Really, I think 'The Descent' is the last proper horror film I really enjoyed. Two decent examples. http://j-button.deviantart.com/art/Behind-Closed-Doors-124711761 http://www.youtube.com/watch?v=W4s9V8aQu4c isn't bad either.