1949 – A communist party congress in Czechoslavkia declares its right to educate children in atheistic Leninism without regard for their parents’ religious values.
Marxist–Leninist atheism is a part of the wider Marxist–Leninist philosophy (the type of Marxist philosophy found in the Soviet Union), which was irreligious and anti-clerical, while at the same time advocating a materialist understanding of nature. Marxism–Leninism holds that religion is the opium of the people, in the sense of promoting passive acceptance of suffering on Earth in the hope of eternal reward. Therefore, Marxism–Leninism advocates the abolition of religion and the acceptance of atheism. Marxist–Leninist atheism has its roots in the philosophy of Ludwig Feuerbach, G.W.F. Hegel, Karl Marx, and Vladimir Lenin.