So what is a fair way to judge the difference (assuming such judgment is necessary)? Here is how I would do it. If the event has a spiritual purpose, than it should be considered a miracle regardless of the religion of the person or persons involved. If it is for a clearly material purpose, than it is not a miracle, but more appropriately considered sorcery. Where things get problematic is that it is often not obvious if the event is serving a spiritual purpose or a material one. And sometimes, an event can have both material and spiritual results. So if, for example, someone accurately predicts winning lottery numbers, that is clearly a material thing and can be considered sorcery (or witchcraft, if you prefer). But if the event saves a person's life, is that material or spiritual? It could be strictly material, but it could also be both. Saving a person's material body is a material goal, but if it is done because that person will later help save the souls of others, than it also has a spiritual purpose.

    So, since it is often not obvious if an event has a totally material purpose a mix of material and spiritual, it is best to assume that it could be a miracle rather than sorcery, and act accordingly.