Why can't humans on Earth be healed like those in Spirit can

It is because of your belief and doubt that you are Spirit as opposed to just a body. It creates limits on your reality. You are always searching for labels, explainations, justifiactions, and reasons. If you could surrender to complete acceptance of the Energetic Spiritual healing, you would become healed. Trust not in the unseen; Rather know that all is Spirit and all returns to itself in proportion to spiritual vibration.