In my view such studies demean the Maker (if there is one), anyway.   A
supernatural force or intelligence would not be  constrained by the "normal"
variations in illness outcomes that necessitate such statistical analyses.
It would also not be constrained by what is normally possible.   It/He
should produce true miracles, things outside normal experience,  as
described in various Holy books and as pretended to occur in the
fundamentalist healing serivices of Benny Hinn etc.   We should see severe
coronary atherosclerosis there one day and gone the next, and the truly
paralysed getting up and walking.

One reason for saying this is that statistical outcomes are always just
that, mere probabilities, and, moreover,  probabilities that are very much
at the mercy of the many artefacts that so readily creep into clinical
studies.  They are certainly never likely to sway prior beliefs.

Peter Moran