deep said:
I suppose if one were told all of their friends gathered and prayed for them
it could cause the sick person to fell better.
again the power of suggestion.
To me this is really the bottom line, though I probably would have worded it "the power of support" rather than suggestion.
I am not a believer in prayer purely in and of itself as a healing tool, however, this study does come with two significant qualifications:
1) After 30 days, the death rates and incidence of complications across all 3 groups (people who knew they were being prayed for; people who didn't know; and people who neither received prayers nor expected to) dropped to essentially the same. So, they can't really discount the possibility of, for example, post-op anxiety generated by feeling like they "had something to prove," or like their doctors must really have considered them bad-off to warrant selecting them for mass prayer, on the health of that first group (who had the highest initial complications rate).
2) Those offering the prayers had no personal connection to the sick people, and there was never any interchange between them.
When I was recovering from brain surgery last December-January, my entire family including my siblings and mother basically dropped whatever else they were doing for the bulk of that time to be with me in the hospital, help out with our kids, etc., and prayer was an integral part of that. Not grim, illness-focused prayer--just sharing the usual Torah portion and prayers that would've been said that day anyway, etc. It certainly was very comforting and reassuring for me, which I am certain helped speed up my recovery. However, obviously I can't disentangle the effects of their prayers from my awareness of their presence and support more generally--nor should I really, that's ultimately what it's all about, IMO.
So while I take the notion that a total stranger's prayers, offered without the benefit of any interpersonal contact (physical, online, whatever), could actually help heal anyone with a grain of salt, I do think it would be unfortunate to dismiss the healing benefits of knowing that someone you have a personal connection with is praying for you based on this study.