Marek Jędraszewski in his article The Communist Party fighting with religion and the communist state guaranteeing religious freedom, as theoretic background for Marxism-Leninism in fight against religion and Catholic Church in the countries o f real socialism, presents philosophical and ideological principles, which direct the course of politic of communists states in the battle against religion and Church, especially Catholic Church. The author shows sources of that in antireligious thoughts of the modem Europe: deism of Enlightenment and philosophy of Feuerbach for whom the sole condition of substantial human freedom was appreciation of radical atheism. Next, author presents the Marxist conception of religion as the “opiate of the masses”...