Originally Posted by Willamena
Sufficient, no. It is more likely that the prayers themselves, and not an absent third-party entity, are responsible for healing. Looking to observations for solutions returns a more believable answer than looking to the unobservable for solutions.
That's what I was thinking too. There might be an inherent positive power with "thinking nice thoughts" about people. (As well as the reverse). You would have to somehow separate the effects: If the results of the first experiment show that there was a statistical healing advantage for the group that was prayed for, then set up a new experiment, where some people pray to God to heal the person and some merely think nice, healing thoughts about the person.
“You run a grave risk, my boy," said the magician, "of being turned into a piece of bread, and toasted.” ~from The Once and Future King