This idea has been tested repeatedly — usually, the studies have flaws. And even when the results show that the intercessory prayer has no effect on anyone, those who believe in it will look at the hits and ignore (or rationalize) the misses.
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Download the Atheos App
Atheos is an app being developed by Dr. Peter Boghossian and his team that helps people have non-confrontational discussions about gods, religion, faith, and superstition. It will show you how to gently explore a person's strongest beliefs.