Roger Garaudy, the renowned French Marxist-Islamist theoretician. Photo from Archives fédérales allemandes.
God did not want these inequalities only among creatures of the inferior kingdoms—the mineral, vegetable, and animal—but also among men and, therefore, among peoples and nations. With these inequalities, which God created harmonious among themselves and beneficent for each category of beings as also for each being in particular, He wanted to furnish man with most abundant means to have His infinite perfections always present. The inequalities among beings are ipso facto a sublime and most ample school of anti-atheism. 
The French writer Roger Garaudy (a communist later “converted” to Islam) seems to have understood this, for he highlights the importance of the elimination of social inequalities for the victory of atheism in the world.
“It is not possible for a Marxist to say that the elimination of religious beliefs is a sine qua non condition for the establishment of Communism. On the contrary, Karl Marx demonstrated that only the full realization of Communism, by making social relationships transparent, would make the disappearance of religious concepts possible in the world. For a Marxist it is thus the establishment of Communism which is the sine qua non condition for the elimination of the social roots of religion, and not the elimination of religious beliefs which is the condition for the construction of Communism.” (Roger Garaudy, L’homme chrétien et l’homme marxiste: Semaines de la pensée marxiste—Confrontations et débats [Paris-Geneva: La Palatine, 1964], p. 64.)
Photograph of Fr. Michael Pro being executed by Mexican Marxists
To desire to destroy the hierarchical order of the universe is, then, to deprive man of the resources by which he can freely exercise the most fundamental of his rights, which is to know, love, and serve God. It is, thus, to desire the greatest of injustices and the most cruel of tyrannies.
Plinio Corrêa de Oliveira, Nobility and Analogous Traditional Elites in the Allocutions of Pius XII: A Theme Illuminating American Social History (York, Penn.: The American Society for the Defense of Tradition, Family, and Property, 1993), Documents V, p. 488.
