Why do the heathens rage and the nations utter folly?

"The great “social reintegration” into a threefold “catholicism” of Roman Catholicism, nationalistic socialism, and humanistic communism referred, then, not simply to a reintegration taking place in the religious fascism of the Third Reich, but also to what he perceived to be a growing nihilism at work especially in the younger generations in the United States."

Catholicism = Nazism, Marxist-Leninism, and nihilism? 

Perhaps somebody could explain the quote above, excerpted from La Perruque blog?