One of the objections to the Pythagorean argument is the reference to the authority of modern physicists, most of whom call themselves atheists or agnostics. Even if there had not been any atheists among the founding fathers of physics, something is wrong with the argument of the intelligent design of the Universe, since so many physicists of the last half-century do not believe in God, the critique goes. To answer this sort of objections, we discuss here the views of Richard Feynman, Steven Weinberg, and Stephen Hawking, each of whom called himself an “atheist”. We attempt to show in what sense they indeed were atheists and in what sense they were not. Roger Penrose, the eminent physicist and thinker, called himself “rather agnostic”, but he was convinced of the universe’s purpose, and explained what this conviction was based on: not blind faith but the very special character of the physical laws and the initial conditions of the Big Bang. Penrose illustrated his metaphysical views by means of graphic images, one of which we discuss in a dedicated chapter. Our review of contemporary physicist-philosophers would be very incomplete without the “practicing but unbelieving Christian” Freeman Dyson, with his concept of “the most interesting of all possible worlds”, and so we talk about him too. We also consider Max Tegmark’s mathematical multiverse hypothesis and show that it does not stand up to criticism in light of the cognitive self-consistency of the universe. Is it rational to reject the hypothesis of intelligent design when all other hypotheses about the cause of the highly refi ned nature of physical laws fail? The chapter “Absurdity and Skepticism” is devoted to this question. At the end of this essay and the whole series, we familiarize the reader with the view of the mass man in science and the nature of his “atheism” that was expressed by Jose Ortega y Gasset, supported by Erwin Schrödinger, and commented on by Steven Weinberg.