I wonder if he would agree to an experiment, method he kneels down and an assault rifle is aimed at his head, he stars to pray, the theory is that 'god' will protect him. Gun is fired at close enough range to kill instantly.
Make notes of result.
Somehow I don't think he, despite all his faith, he would agree.
if that happens, then you can point out that god never saves massacre victims, so god would not have saved him either.