If you pray for yourself to get well, or are aware of others who are praying for you, there is sometimes a marginal improvement, but this is apparently due to the placebo effect. However, there is no credible evidence that intercessory prayer, which is prayer by strangers, at a distance, without the knowledge of the recipients, works. If one believes that intercessory prayer works, it is easy enough to test it. Just have your entire congregation pray that all of the women in New York City who conceive this month will refuse to have an abortion. If the prayer works, then the birth rate in that city will show a huge spike upward nine months from now.