You can't argue with a scary metaphor.
And I have to credit djeggnog for his scary phrase referring to people who don't believe the same things he does, as those who: "unknowingly walk about blindly in religious dungeons of ignorance."
My favourite scary metaphor I've read is for people who leave the religion: "Those who enter the world of Satan and become part of the Antichrist."
What's your favourite scary metaphor?