Folk medicine is demonstrably useful, even if it's chock full of superstition and nonsense.
What benefits actually derive from religion that make it not worth throwing out before it's picked over?
Check Buddhism, Taoism and Hinduism. Numerous valuable things in there - including yoga, meditation, and lots of Taoist health practices.
BHTV episode with myself and Adam Frank, author of "The Constant Fire", on whether or not religious experience is compatible with the scientific experience, or worth trying to salvage.