The article deals with issues related to the history of the relations between churches as institutions, and their individual clergymen, and the Nazi state. The source referred to in this article is the intimate journal of Minister Friedrich Onnasch (1881–1945), the superintendent of the Koszalin Church District and parish priest of Saint Mary’s Church in Koszalin, murdered by Soviet troops in Barlinek in February 1945. A document written on a regular basis, never published, is a detailed account (though coded, due to censorship), showing the experience of the clerical office in a time of totalitarian oppression. It shows the situation in the Evangelical Church after 1933 and the commitment of Minister Friedrich Onnasch and others, among them Dietrich Bonhoeffer (1906–1945), associated with Pomerania, in the movement of the Confessing Church. It explores the areas of Christian religion in its Evangelical topography, limited to the space of the former Prussian province of Pommern (Provinz Pommern) and Western Pomerania after 1945.