Does praying for things work?

Please ignore my last post. I was just frustrated because my question keeps getting erased, but I'll figure it out. I have one simple question: Has there ever been a scientific experiment trying to show the success rate people who pray for good results, vs people who don't. If anyone knows of any such experiment, please post a link, or tell me what you can about it. You see, I'm arguing with a Christian who says God "answers his prayers", and he claims that that's evidence proving God's existence (of coarse this argument is retarded for many reasons). Still, I would like to have some DATA showing that those who pray have the same success rate of those who don't pray. Can anyone find anything? -peace
Atheist Answer: 

Refer to The God Delusion by Richard Dawkins, or directly to the source: American Heart Journal vol. 151:4, "Study of the Therapeutic Effects of Intercessory Prayer (STEP) in cardiac bypass patients: A multicenter randomized trial of uncertainty and certainty of receiving intercessory prayer". Here's the abstract.

The results were roughly as follows:
- Those who didn't know whether they were receiving prayers showed no difference between the sub-group which really was receiving prayers and the sub-group which wasn't.
- Those who knew they were NOT receiving prayers did better than those who were receiving prayers and knew it.

The second point doesn't suggest that prayers are harmful in and of themselves. The going hypothesis is that the knowledge of prayers was a kind of social pressure which tended to result in complications.

- SmartLX

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