Communism is naturalized humanism. Karl Marx
The propaganda of atheism is necessary for our programs. Vladimir Lenin.
According to the University of Cambridge, historically, the "most notable spread of atheism was achieved through the success of the 1917 Russian Revolution, which brought the Marxist-Leninists to power."
Marxism - Investigating Atheism
Vladimir Lenin explains it thusly: "A Marxist must be a materialist, i. e., an enemy of religion, but a dialectical materialist, i. e., one who treats the struggle against religion not in an abstract way, not on the basis of remote, purely theoretical, never varying preaching, but in a concrete way, on the basis of the class struggle which is going on in practice and is educating the masses more and better than anything else could."
Lenin: The Attitude of the Workers' Party to Religion
In 1955, Chinese communist leader Zhou Enlai declared, "We Communists are atheists"
Noebel, David, The Battle for Truth, Harvest House, 2001.
China’s Communist Party Reaffirms Marxism, Maoism, Atheism, Thursday, 20 November 2014
"The Communist Party of China (CPC) is letting its members know that the party’s official adherence to militant atheism has not changed; Party members are not allowed to be Christians, or to hold any other religious beliefs. That is the clear message sent by a top Party official in an editorial published on November 14 in the Global Times, the international version of People’s Daily, the official newspaper and mouthpiece of the CPC.
The editorial, written by Zhou Weiqun, chairman of the Committee on Ethnic and Religious Affairs of the Chinese People's Political Consultative Conference, blasted Chinese academics who suggest that Communist Party members can also adhere to any religion. This prohibition against religion has been a “consistently upheld principle” since Mao Zedong, the founder of the People’s Republic of China, declared Zhou. “It’s impossible to have another choice besides the dialectical materialist worldview.”..."
China’s Communist Party Reaffirms Marxism, Maoism, Atheism