If you were lying vegetative, with nothing more or less to be done by doctors, would you want your family and friends to be in the 80% or the 20%?
I would want a Brazilian shaman to blow smoke, dance in a circle, and shake a rattle. My family and friends might pray however because it would make them feel better. The good thing about faith is that it helps some people and it works whether what they have faith in is real or not.