I remember someone making a bid deal out of apparently burning a Charizard card and seeing a pentagram inscribed inside as it turned into ashes or something.
Found an article I read years ago. It's a bit tl;dr, but just skimming through should get the idea across.
I especially love the "What Can Parents Do?" section.
What Can Parents Do? Wrote:2. Share your observations. Spark awareness in a young child with comments such as, "That monster looks mean!" or "That creature reminds me of a dragon," along with "Did you know that in the Bible, serpents and dragons always represent Satan and evil?"
3. To teach young children a Biblical attitude toward evil before they learn to delight in gross, ugly characters, make comments such as, "Who would want to play with that evil monster? I don't even like to look at him. Let's find something that makes us feel happy inside." (Being molested by priests.)