I know a lot of teenagers who've started dabbling in witchcraft/Wicca can get a bit pushy in sharing their new belief system, up to and including writing fanfiction set in fantasy worlds, where they convert all the magically talented characters to Wicca (much as pushy Christians will convert their favorite characters, up to and including villains/antagonists). I've seen it done with Harry Potter and the movie version of John Constantine, and even introducing it to Middle Earth (!). No doubt some teenybopper who's read Silver Ravenwolf's "Teen Witch" a few times too many would do the same to Harry Dresden. Despite his staunch self-identifying as "theological Switzerland" and the bit in Death Masks when Father Forthill asks him if he's ever going to convert from Paganism, and he replies something to the effect that he isn't Pagan, so he doesn't have to.