I think it'll prove nothing to either religionists or scientists. If you believe in a providential deity, such as the god of the three great Abrahamic religions, -- a deity who specifically forbad that he be put to the test, then the results of this study will do nothing to sway your belief; if anything it could, perversely, be taken as confirmation of the absoluteness of God's decree. Of course it's practically impossible to to have any proper controls in a study of that nature. Who's to say that the patients aren't being prayed for by people unknown to those conducting the study? Reducing the superessential and metaphysical to the statistical is an obvious absurdity.