By John Blake, CNN

(CNN) - When the horror novelist Stephen King was once asked why he wrote such gross stories, he said he did it because he had the heart of a small boy - which he kept in a jar on his desk.

With his beady eyes and I-just-killed-the-cat grin, King looks and sounds like a horror novelist. But when the Rev. Paul F.M. Zahl read several of King’s novels, he learned something new about the author: There’s a lot of faith behind his fright.

Zahl says some of the most stirring affirmations of Christian faith can be found in the chilling stories of King. The horror master has been preaching sermons to millions of readers for years, only most of King’s fans don’t know it, he says.

“People tend to think that Stephen King is anti-religious because he is a horror writer, but that’s completely mistaken,” says Zahl, a retired Episcopal priest who has written about King’s religious sensibility for Christianity Today magazine. “Several of his books are parables of grace in action.”

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