ヴュルテンベルク福音主義州教会
Baumann was born in Stuttgart, Germany. After studying Protestant theology at Tübingen and Marburg since 1922, Baumann was pastor of the Evangelical-Lutheran Church in Württemberg. Because of his Bible study and under the influence of Kirchenkampf during the Third Reich as well as intensive contact to Catholic Christians especially during the Second World War, he came in 1941 to the conclusion that after the Gospel of Matthew 16.18 and Gospel of John from 21.15 to 17 Jesus said Simon Peter was transmitted order to be understood as a continuing until the end of time office, which in the Roman Pope was realized. For a mystical experience on August 19, 1942 at Binzwangen he found himself assigned to unite the Protestant Church with the Roman Catholic Church.