Hi Tom
Jesus is quoted in the bible as frequently saying "your faith has healed you"
so clearly faith was required.
The mind can make you sick, the mind can keep you sick and the mind can cure you
this is recognised today and they call it psychosomatic illness. (it is still real disease though)
So maybe many diseases are psychosomatic and pathogens are often just opportunists invading a body weakened by the mind.
No medicine is going to be sufficient if the body continues to be weakened by a stressed and disturbed mind