The given article is called to introduce into Ukrainian scientific discourse the concept of “sergianism” – the subjection of the Moscow Patriarchate in 1927 to the atheist Soviet state, as a result of which the ROC MP became a component part and one of the important propagandist mouthpieces of the internal and external politics of the USSR and its ruling party, the Communist Party of the Soviet Union. One of the manifestations of sergianism is the spreading in the church milieu of the cult of Stalin and, linked with it, the religious cult of the “GFW” (“Great Fatherland War”) or “the religion of Victory”, which in the contemporary Russian Federation has taken the place of the ideology of communism. The “Religion of Victory” as a disguised form of Stalinism is an official state and ecclesiastical doctrine in the RF, which justifies the ideas of “Soviet revanchism” and the aggressive politics of the government of the Russian Federation. The article has not only a scientific, but also a practical character; its aim consists in drawing the attention of the scientific community and society in Ukraine to the problem of sergianism, insofar as the ecclesiastical community in Ukraine plays a significant role. However, the processes of decommunization have scarcely touched it. The scientific novelty consists in the fact that such concepts as “ecclesiastical Stalinism” and “the religion of Victory”, and the problems associated with it are being introduced into Ukrainian scientific discourse for the first time.