I agree. Solzhenitsyn warning to the west was indeed an important one.

“[T]he important thing is that you should not argue with them. Communism has become an intensely dogmatic and almost mystical religion, and whatever you say, they have ways of twisting into shapes which put you in some lower category of mankind.” ― F. Scott Fitzgerald

“Communism is as crude an attempt to explain society and the individual as if a surgeon were to perform his delicate operations with a meat ax. All that is subtle in human psychology and in the structure of society (which is even more complex), all of this is reduced to crude economic processes. The whole created being—man—is reduced to matter. It is characteristic that Communism is so devoid of arguments that it has none to advance against its opponents in our Communist countries. It lacks arguments and hence there is the club, the prison, the concentration camp, and insane asylums with forced confinement.” ― Alexander Solzhenitsyn, Warning to the West

“Marxism was a simple substitute for Christianity. Replace God with Marx, Satan with the bourgeoisie, Heaven with a classless society, the Church with the Party,” ― Arundhati Roy, The God of Small Things

"A belief in heaven is an assertion of the immortality of the soul, and the Moral Order of the universe. Without this faith, we'll never see heaven on earth. We're seeing hell instead." - Mike Stone, Restoring Belief in Heaven

Regarding atheism, Aleksandr Solzhenitsyn declared "Men have forgotten God":

"Over a half century ago, while I was still a child, I recall hearing a number of old people offer the following explanation for the great disasters that had befallen Russia: "Men have forgotten God; that's why all this has happened." Since then I have spent well-nigh 50 years working on the history of our revolution; in the process I have read hundreds of books, collected hundreds of personal testimonies, and have already contributed eight volumes of my own toward the effort of clearing away the rubble left by that upheaval. But if I were asked today to formulate as concisely as possible the main cause of the ruinous revolution that swallowed up some 60 million of our people, I could not put it more accurately than to repeat: "Men have forgotten God; that's why all this has happened."

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“It was Dostoevsky, once again, who drew from the French Revolution and its seeming hatred of the Church the lesson that "revolution must necessarily begin with atheism." That is absolutely true. But the world had never before known a godlessness as organized, militarized, and tenaciously malevolent as that practiced by Marxism. Within the philosophical system of Marx and Lenin, and at the heart of their psychology, hatred of God is the principal driving force, more fundamental than all their political and economic pretensions. Militant atheism is not merely incidental or marginal to Communist policy; it is not a side effect, but the central pivot.”― Aleksandr Solzhenitsyn (1918 – 2008)

“Critical Theory’s (Frankfurt School) coming from influence on the New Left in the late 1960s and 1970s ensured that American society would be infected by this Marxist malignancy. While it addressed many aspects of social structure, Critical Theory, in the final analysis, proposed activities that would transform society into one far more amenable to Marxism. Critical Theory’s “struggle for social change” was an important step in undermining the values, structures, and practices of America’s free market and democratic principles.”

Antonio Francesco Gramsci (1891 – 27 April 1937) was an Italian Marxist philosopher and communist politician. He wrote on political theory, sociology and linguistics. He attempted to break from the economic determinism of traditional Marxist thought and so is considered a key neo-Marxist. He was a founding member and one-time leader of the Communist Party of Italy and was imprisoned by Benito Mussolini's Fascist regime.

“Gramsci set out to provide a revolutionary blueprint that would pervert the Roman Catholic Church’s values of goodness and forgiveness into a mind control tool in the hands of the new Marxists. He knew that the working classes were defined by their Christian faith and their Christian culture. Christianity, Gramsci recognized, blocked the way toward uprisings by the workers against the ruling class. No matter how strong might be their oppression, the working classes defined themselves in terms of their Christian faith. Christian culture liberated the working classes against even the most repressive secular abuses. While Gramsci shared the world views of Marx and Lenin concerning a future “workers paradise,” he knew that it had to come about in a wholly different way than through violent revolution. A high priority item for contemporary radical Leftists, therefore, is to destroy religion, a competitor for winning the “hearts and minds” necessary for Marxist revolution. For the Left, worship of God must be replaced by a worship of man, or “secular humanism.”

In the case of new radical left it is the worship of women and secular humanism was replaced by the identity politics.

“What was essential, insisted Gramsci, was to Marxize the INNER man. To secularize him to the point of godlessness. Only when that was done could you successfully dangle the utopia of the ‘Workers’ Paradise’ before his eyes, to be accepted in a peaceful and humanly agreeable manner, without revolution, violence or bloodshed.”

― Robert Chandler, Shadow World: Resurgent Russia, the Global New Left, and Radical Islam

...though ours is a godless age, it is the very opposite of irreligious.