Protestant Church in Germany

From the Peace of Augsburg in 1555 to the end of the First World War and the collapse of the German Empire, some Protestant churches were state churches. Each Landeskirche (state or regional church) was the official church of one of the states of Germany, while the respective ruler was the church's formal head (e.g. the King of Prussia headed the Evangelical Church of Prussia's older Provinces as supreme governor), similar to the British monarch's role as the Supreme Governor of the Church of England.

This changed somewhat with growing religious freedom in the 19th century, especially in the republican states of Bremen, Frankfurt (1857), Lübeck, and Hamburg (1860). The greatest change came after the German revolution of 1918–1919, with the formation of the Weimar Republic and the abdication of the princes of the German states. The system of state churches disappeared with the Weimar Constitution (1919), which brought about disestablishment by the separation of church and state, and there was a desire for the Protestant churches to merge. In fact, a merger was permanently under discussion but never materialised due to strong regional self-confidence and traditions as well as the denominational fragmentation into Lutheran, Reformed, and United and uniting churches.

During the Revolution, when the old church governments lost power, the People's Church Union (Volkskirchenbund) was formed and advocated unification without respect to theological tradition and also increasing input from laymen. However, the People's Church Union quickly split along territorial lines after the churches' relationship with the new governments improved.

It was realised that one mainstream Protestant church for all of Germany was impossible and that any union would need a federal model. The churches met in Dresden in 1919 and created a plan for federation, and this plan was adopted in 1921 at Stuttgart. Then in 1922 the then 28 territorially defined Protestant churches founded the German Evangelical Church Confederation (Deutscher Evangelischer Kirchenbund, DEK). At the time, the federation was the largest Protestant church federation in Europe with around 40 million members. Because it was a federation of independent bodies, the Church Union's work was limited to foreign missions and relations with Protestant churches outside Germany, especially German Protestants in other countries.

In July 1933, the German Evangelical Church (Deutsche Evangelische Kirche, DEK) was formed under the influence of the German Christians, a pro-Nazi religious movement. They had much influence over the decisions of the first National Synod, via their unambiguous partisanship in successfully backing Ludwig Müller for the office of Reich bishop. He did not manage, however, to prevail over the Landeskirchen in the long term. The Confessing Church arose in resistance to the Nazi regime's ideology. After the installation of Hanns Kerrl as minister for church matters in a Führer-directive of 16 July 1935 and the foundation of the – in the end not materialising – Protestant Reich Church, the DEK played more or less no further role.

In 1948, freed from the German Christians' influence, the Lutheran, Reformed (including the German Reformed Church / Reformierte Kirche) and United churches came together as the Protestant Church in Germany at the Conference of Eisenach. In 1969, the regional Protestant churches in East Germany and East Berlin broke away from the EKD and formed the League of Evangelical Churches in the German Democratic Republic (German: Bund der Evangelischen Kirchen in der DDR, BEK), in 1970 also joined by the Moravian Herrnhut District. In June 1991, following German reunification, the BEK merged with the EKD.

While the members are no longer state churches, they enjoy constitutional protection as statutory corporations, and they are still called Landeskirchen, and some have this term in their official names. A modern English translation, however, would be regional church. Apart from some minor changes, the territories of the member churches today reflect Germany's political organisation in the year 1848, with regional churches for states or provinces that often no longer exist or whose borders changed since. For example, between 1945 and 1948, the remaining six ecclesiastical provinces (Kirchenprovinzen), each territorially comprising one of the Old Prussia provinces, within the Evangelical Church of the old-Prussian Union assumed independence as a consequence of the estrangement among them during the Nazi struggle of the churches. This turned the Evangelical Church of the old-Prussian Union into a mere umbrella, being itself a member of EKD (and the BEK, 1969–1991) but covering some regional church bodies, which were again themselves members of EKD (and the BEK, 1969–1991).

Since 1973, when many Protestant churches in Europe, including the EKD members, concluded the Leuenberg Agreement, also the then 21 EKD members introduced full communion for their parishioners and ministry among each other.