Other tidbits from the Demonology have survived into modern popular fiction, though, notably the use of circles or geometric diagrams to contain summoned demons, and the rule that accidentally breaking the circle lets the demon/Satan do whatever he wants with you for free.

and James furthermore claims that witches are in the habit of congregating in churches for their blasphemous rituals. The Devil apparently shows up in person at these little soirées, implying that churches aren't quite the inviolate ground that they're made to be in Hollywood.