At the beginning of the 20th century, with the emergence of the Nazi government in Germany and the subsequent start of the world wars and the role and presence of the Nazi German government led by Hitler in this war, new challenges arose for the church. Within the Protestant Church, there were different responses to this issue and the situation that had arisen, and two completely opposing factions emerged within the Protestant Church. The Confessing Church movement against the Nazi regime and the German Christian group in support of this regime were established. Following the intensification of the actions of the government and priests supporting the Nazi regime, members of the Confessing Church, centered on Karl Barth, convened a meeting in Barman and adopted the "Barman" Declaration in six articles with the aim of preventing the distortions of German Christians in theology and the Christian church. This article will address the grounds and consequences of issuing this declaration using the method of historical analysis. The findings of this study indicate that this declaration sought to confront the dualistic view and establish the supremacy of Christ over the church and the state, and paved the way for the excessive actions of the Nazi government. Although this declaration left its mark and was able to challenge the epistemological foundations of the ruling spectrum to some extent, it failed to have the significant impact on approaches due to the failure of the members of the confessing church to agree with its provisions.