After World War II, Poland became a country ruled by communists, who were opposed to, among other things, the presence of religious instruction in public schools. During the Second Republic, according to Article 120 of the 1921 Constitution, religion was a compulsory subject. The purpose of this article is to show in what legal acts the state authorities removed religious instruction from school. The first legal act of 1945 - circular issued by the Minister of Education restricted the teaching of religion, and subsequent ones from the 1950s increasingly depreciated this school subject, abolishing its compulsory nature, creating schools without religious instruction under the secular Society of Friends of Children, until its complete removal in the 1961 Law on the Education System.