I think you are wrong about that. You should re-read this from the Prager article:
"In fact, the emergence of communism and Nazism in an increasingly secular Europe is one of the most powerful arguments for the need for Judeo-Christian religions. Europe's two secular totalitarian systems perfectly illustrate what G.K. Chesterton predicted a hundred years ago: "When people stop believing in God, they don't believe in nothing -- they believe in anything."
So Prager is telling us that if we don't believe in God, we don't believe in anything. And by inference, this lack of belief leads us to socialism and totalitarianism. That is what he saying and that is just nonsense.
Wow, you totally misread that quote.
You said - “So Prager is telling us that if we don’t believe in God, we don’t believe in anything.”
The actual quote - “When people stop believing in God, they don’t believe in nothing — they believe in anything.”
The quote clearly contradicts what you say.
What Chesterton said, and Prager quoted, was that not believing in God leads to a belief in anything.
The truth is that everyone has some system of beliefs, for religious people it is derived from God, for the non-religious it is based on something else, materialism, utopian philosophy, Communistic theory, the ideals of Nazism, etc.