The only real Christian "magic" is prayer, and that's not specifically designed to ward off evil.
I agree with your legal analysis (very thorough and informative in fact - well done). However, consider that the casting of spells is only illegal because we dont believe in their efficacy. Once we do start thinking they can really adversely affect people, then the next stage is to make them illegal, and before long we are back, literally, to witch hunts.
I agree there is evil intent here, and possibly incitement to commit harm (which definitely is illegal) but that's going to be hard to prove.
“The only real Christian “magic” is prayer...”
I would suggest that there are two other forms of Christian “magic”.
The first is science. A lot of “magic” is just embracing phenomena, perhaps with some sleight of hand, illusion and showmanship. But if you are familiar with scientific theories of phenomena, you can dispel “magic” with “scientific proof” that it is not magic.
That this is a Christian thing is a truism, because the philosophy of the scientific method, and the acceptance of science as genuine, can both be claimed by Christians. For many religions, science is still looked at as questionable.
There is a witticism that “Scientific knowledge does not dispel the fear of the gods”; but in Christianity, it does.
The other Christian “magic”, can best be called “pre-scientific”, objective pragmatism. Called things like “old wives tales”, it boils down to *not* ascribing magic to things you don’t understand, but trying out things that can mitigate them. A huge example of this is herbalism.
This is different from science, but it ignores “magic” and says, we don’t know what causes this problem, but ‘x’ seems to fix it.
The best fairly recent example of this prescience has little to do with traditional Christianity, but came about under the pseudo-Christianity of “healing witches” in South America. They blend some Christian and scientific ideas with traditional healing practices for their patients.
In practice, they have a similar personality to western doctors, and are seen as professional people by the Indians.
In any event, decades ago, some very persuasive individual convinced these healing witches of the efficacy of the powerful magic known as antibiotics. My point is that once it was proven to them that they worked, they seamlessly integrated it into their practices.
“I need to you burn three green candles, while praying to Saint Lucia, and take three Amoxicillin pills a day, once with each meal, until you have taken them all.”
While on the surface it is easy to say that the antibiotic does all the work, the psychological and spiritual side of things should not be ignored, because both are important facets of the healing process.