In the book of the famous Orthodox scientist and publicist V.P. Semenko, summing up his research in recent years, explores the phenomenon of liberal and modernist movements in the modern Orthodox Church, mainly using the example of the Russian Orthodox Church, shows their kinship with similar phenomena in other Christian denominations, analyzes the false reformist views of a number of representatives of these movements seeking to impose their church fullness, demonstrates the danger of church reformism, which undermines the foundations of the Orthodox tradition, for the very existence of the Church as an institution. The views of such representatives of modern church modernism as Abbot Peter (Meshcherinov), priest Georgy Kochetkov, Protodeacon Andrey Kuraev and others are subject to critical analysis. The author speaks from a strictly conservative position, based on the Holy Scripture and Holy Tradition, the great spiritual and theological patristic tradition. The depth of system analysis is combined in the book with journalistic brilliance and a polemical form of presentation. For a wide range of readers.