The Devil invented lies to turn the power of speech into a weapon of falsehood. And God invented the parable, the poem, the epic, the song, and the sonnet in order to turn the power of lies into fables, myths, types and shadows, to turn fiction into a weapon of truth.
I know more people who were converted by Aslan than by Aquinas. What does that tell you about the power of fiction?
I could tell my co-workers about how Satan operates, how he tries to manipulate people into damning themselves. But they would yawn and tune me out faster than you could blink.
Put a copy of "The Screwtape Letters" into their hands, however....