Interesting perspective on the mfk logo. In a literal interpretation of the Bible, I see your point. That said, I don't think any one religion, or religions in general, have exclusive pervue over all horny beasts or pitch forkin fairies. The modern image of the devil is born from the collected works of the past... modern christianty is well known to have borrowed popular traits of other religions (see conference of Nicea etc) and I imagine the traits Christians associate with the devil have a shared history with other religions, fairy tales, and colloquial myths/stories.