How do I convince someone that a children's card game is not satanic?

I know it's kind of wrong to to tell someone what they believe in isn't true, but I think that it's just ridiculous for someone to say that something like Pokemon or Yu-Gi-Oh is satanic based on very little evidence that doesn't add up at all. How do I tell someone that these are just games and that you can't look for something satanic in something that's just pieces of cardboard.
How do I convince someone that a children's card game is not satanic?
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