To the degree that our faith is an expression of our wholeness, then faith can help our health. But faith for many is a neurotic attempt to hide from reality, or to lessen life’s fears and anxieties. Then it is a symptom of sickness not health and may well reveal itself somatically.
Faith is something one lives, not something one says or something one does. If that distinction is not grasped then much of it is nonsense.