I believe that magic does exist, OWK already knows I believe things that cannot be objectively proven so this should come as no surprise to him, and I believe that magic is use of demonic power. What I do not believe, however, is that an author can write into reality a fictional world. Tolkien's Middle-Earth does not exist. Rowling's Hogwart's does not exist. These are sub-creations, below creation (make believe), and as such the creators of these sub-creations can create whatever rules they want for these sub-creations. Just as God created the rule that the area of a circle is always PiR2, and he created the rule that the use of magic is evil, Tolkien and Rowling created their world with the rulesthat magic is neutral and the intent of the magician gives it's use morality. Lewis wrote The Chronicles of Narnia as a work of allegory, and as such he mirrors the real world in his sub-creation, which is why the rules are much closer than Tolkien and Rowling, but this is clearly not what the latter two have done.
As for not knowing kids, do you understand how important using the imagination is for children's development? Up to about the age of 4, most children would have some difficulty distinguishing between real and imaginary. After that time, however, children start having tea parties with their dolls, start playing army men in the dirt, start pretending they can fly like superman, etc. The reading of a book like Harry Potter is easily understood by children to be "make believe".
Therefore, on a deep level you do not comprehend the mistrust parents have for books about witchcraft aimed at their impressionable eight-year-olds, or the contempt parents hold for those who would corrupt their kids under the guise of "literacy."
Read whatever you want. Just don't tell me you understand anything about the mind of a four-year-old, except what you remember from your own childhood, what you've seen on TV, or what you've read in the Child Psychology 101 syllabus.
Because that's not proof enough for most parents that you know what you're talking about, especially those parents who've read Rowling for themselves and find H.P. vapid, derivative and dangerous.