What Mário Ferreira dos Santos does in this work entitled Sobre Deus (About God) is remarkable. After a brief exposition on the scabrous subject, there follows a very high-level debate in which simply the best arguments for and against the existence of God are confronted. Mário, although he exposes his personal position on the issue beforehand, lets his opponents speak freely. The result is, above all, an enlightening work, whose outcome fatally exposes the terrible contradictions into which those who deny the existence of God throw themselves, that is, the existence of the supreme, eternal, self-sufficient, and indispensable creator. Logic dictates that we must admit it. But there is more, there is a very interesting effect resulting from Mário’s intellectual honesty and wisdom: there are no stronger, more complete and convincing arguments against the existence of God than those raised by Baron de Holbach; and these permeate the work unhindered, free to show their potency. It so happens that when confronted with the irrefutable logical proofs offered by the great scholars of the problem, the logical proofs that demand the existence of a creative principle and require of it the qualities that have generated so much controversy for so long, Holbach’s arguments lose their force, even though they are not being directly refuted. What an effect! Logic imposing itself sovereignly! Everything that could be said against God is said, and said emotively, eloquently, bringing together enough aspects to make no soul indifferent. And yet, the argument fails completely in the face of close examination…