I am a firm believer in the power of the placebo effect. I think that much alte3rnativce medicine (and faith "healing") works because the patient is given attention and a caring interchange.
When I was ill there were friends who I knew were praying for me - I am an agnostic, so did not see this as having a direct effect - but, it was heartening to me that they cared enough to bother, so that was entirely positive. It did not make me better, but made me feel that I was not alone.
Annie - I hear your argument about the parent/child relationship; but find it mildly ridiculous that a believer is onto a win:win situation. Whatever god does or does not do, and however unacceptable it might be, it is always just fine by a believer as that is god's will. Hmm - I remain unconvinced! - but respect your POV.