The main argument used is the Bible says magic is wrong, so any magic in books must be wrong too. This seems like a good argument since it works for other sins, such as fornication, lying, murder, and stealing. Most people who don’t read fantasy consider magic to be the same.
I believe there is a difference between most magic in books and real-world magic. In the real world, “magic” comes from God or Satan. There is no neutral third party. I believe this is why witchcraft is a sin. The power is coming from Satan.
In most fantasy, the magic is similar to electricity. It’s a power that doesn’t come from God or Satan. Certain characters have the ability to plug into this power. Some is close to real-world magic, so those stories may fall into the bad magic side since the magic might come from demons. Other magic comes from something specific so it’s much less like real-world magic. Some of this non-realistic magic is more like superpowers described as magic due to being a fantasy story and not science fiction.
I myself do not write books where magic is used, unless it’s closer to the superhero type, which I never describe as magic, but different authors have different views.
When it comes to reading/watching media with magic in it, I think it is a personal choice. The magic could desensitize the reader to real-world evil, or maybe it’s so fantastical the reader doesn’t think of it in the same vein as the witchcraft of the real world. What may be a stumbling block for one person could be perfectly fine for another.
What do you think of magic in books?