I believe you're refering to Fiendish Codex II, Ninja.
The point, I think, is to have some parallels to Satan to serve as an ultimate evil the players can defeat. Though I do share some of your reservations on the use of biblically-inspired material.
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"Outside of a Warg, a book is a man's best friend. Inside of a Warg, it's too dark to read." - Wargo Marx
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