Vancouver philosophy prof Elijah was an evangelical Christian who turned liberal and then atheistic, and his latest book, "Unbelieving God: A Skeptics Guide," considers and debunks the various arguments for the existence of God.

Mark and Mary chat with him about his journey and about the degree to which we should care about others' beliefs in this area so as to engage them in debate. In the course of this, as you'd expect, God makes a personal appearance (with Mary), and there's an aborted sketch about a brainwashing service.

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