I've seen an argument against witchcraft using everyday considerations, along the lines of witchcraft promoting immediate gratification and such, but I do not remember where. Scriptural-based arguments seem to work ever less these days.
I know this is not a popular thing to say to HP fans, but it is not great literature either, all the rave reviews to the contrary. It is obviously great entertainment because so many enjoy it. But life is short and the really good and great books are many. Why waste time on the second-rate?