1. The theme of the story has strong Christian overtones, with Harry being the “messianic” character.
2. If you were writing a Jewish equivalent, it would end up being radically different. There’s no one to one equivalence between the Christian/ British concepts and Jewish ones.
3. An important aspect, and probably the one frum kids relate to, is that the wizarding sub-culture is a small sub-culture largely hidden from the mainstream and existing with its own values, while be regarded by the mainstream as being somewhat deviant.