Before watching the movie:
I’m not sure if this is so much popular as memetic anymore. It’s still a go-to reference for “creepy and dangerous children”, but I think it’s more referencing other references than familiarity with the film anymore. At least, I haven’t heard of anyone actually watching it recently.
This spawned a ridiculous number of sequels. Yes, it’s a horror movie, but it’s a horror movie about a cult. Seems fairly self-contained.