I have not read in a book, but I have heard that scientists have said that prayer is effective and the cause is not God, but by praying, the subconscious mind of a person gets strength and works well. That is, if a boxer asks for help from Christ before the match, he will get the same result as if he asked for help from Satan.
In some old atheistic religions, they believe that by praying, the souls of people and their ancestors come to help.
In some old atheistic religions, they believe that by praying, the souls of people and their ancestors come to help.