What religion do communists follow?

Answer 1

Most countries where Communism is the dominant belief system discourage any organized religion. They want Communism to be the official ideology and no other belief system is welcomed by the government. (This is based on the fact that Karl Marx was very negative about religion.) But Communist governments have not been successful in totally eradicating religion; they have just pushed it from the public sphere into the private sphere.

For example, in Russia, Cuba, and Poland, religion was either entirely banned or at least discouraged by the Communist government. People in those countries lived an outwardly secular life, as their leaders wanted. But the culture still reflected the influence of the what had been the dominant churches: Russian Orthodox church (in Russia) or the Catholic church (in Poland and Cuba). Eventually, after the Communist leaders lost power in Russia and Poland, church attendance resumed. And in Cuba, which is still a Communist government, the leaders (Fidel Castro and his brother Raul) gradually relented to allow some outward practice of Catholicism. But obedience to the Communist government is still supposed to come first.