The belief that a which doctor can heal all is based on fact. When I say that I mean at one time the local root doctor was a healer in fact. The doctor healed using acquired knowledge gleaned from centuries of practice and passed on religiously from generation to generation. These folk doctors healed using local plants and mixtures and knowledge of what worked. People did not understand how or why thus it was called magic. These doctors in order to insure these practices were repeated in detail were often inspired to invoke religion. Fast forward to the present the folk doctors have been far out performed by modern doctors who benefit from the experience of many different folk doctors and accumulated advances of the world in medicine. The folk doctor is now extinct and has been replaced by charlatans. Replaced by hustlers who have enough knowledge to fool those who have been taught to trust the folk doctor.