Until the days of Copernicus and Galileo everybody believed that the sun revolved about the earth. Was not everybody mistaken? What is more ancient and more universal than slavery? Cannibalism perhaps. From the origin of historic society down to the present day there has been always and everywhere exploitation of the compulsory labor of the masses - slaves, serfs, or wage-workers - by some dominant minority; oppression of the people by the Church and by the State. Must it be concluded that this exploitation and this oppression are necessities absolutely inherent in the very existence of human society? These are examples which show that the argument of the champions of God proves nothing.