The power of prayer. Many people believe in the power of petitionary prayer. For example, it’s often claimed that praying for people with a disease improves their chances of recovery. Yet recent rigorously-conducted large-scale scientific studies do not support this view. Indeed they rather undermine it. In 2006, American Heart Journal published the results of a $2.4 million experiment involving 1,802 heart-bypass patients, conducted under the leadership of Herbert Benson (a specialist who also believes in the medical efficacy of petitionary prayer). The results were unambiguous: prayer had no beneficial effect. A similar large-scale trial of patients undergoing angioplasty or cardiac catheterization also revealed prayer had no effect. That prayer has beneficial medical effects is a religious belief that can be scientifically tested. Tests strongly suggest it’s false.
From the sky will come the great King of Terror.
 There are various ways in which this intuitive problem can be more precisely formulated as an argument against the existence of God. One of the most sophisticated versions is the abductive argument of Paul Draper. See Paul Draper “Pain and Pleasure: An Evidential Problem for Theists” (1989) Noûs, 23 pp 331-350.