I think it's pretty well accepted that a belief or positive outlook will help you get better.
Now here's an interesting thing. I have an uncle, who is/was Professor of Physics at San Diego University, so he's a pretty well educated guy, definitely at the right had end of the curve IQ wise, also ran his own computer software business for 30 years blah blah blah.
He's also Christian and very interested in empirical aspects of religion.
One of the things he's very keen on quoting is empirical research that seems to show the power of prayer. Two patient groups being treated for various conditions were studied. One group was 'prayed for' the other wasn't. The groups were balanced for condition, age, gender, ethnicity etc.
The results show a slight, but consistent and statistically significant positive outcome in the patient group that was prayed for versus the control group that wasn't.
More bizzarely, the experiment is blind, i.e. the patient group being prayed for didn't know they were being prayed for.
I haven't read the research myself but my uncle has just published a book on the whole subject so I imagine it's quoted in there. I will find it and post the link.
A: there is no god, we're on our own.
B: there is a god, and he doesn't give a shit. We're on our own.
Jambo that's pretty much the conclusion I've reached, except that in the second part I reason that there is a God, but as long as we lead 'good' lives, he doesn't care what we believe in.