You realise that studies have shown praying is bad for you? Group prayer sessions, particularly things like gospel meetings or those evangelical shows change the brain chemistry. That feeling of well being and a 'presence' is caused by brain chemistry. It can cause excessive dopamine levels, which damage the brain - in extreme cases causing psychosis, hallucinations, delusions and even schizophrenia like certain prolonged drug abuse can!

I'll have to find the link to the article...
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -
Albert Einstein