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Following the decline in number of parishioners due to the German demographic crisis and growing irreligion, the Church was subsumed into the Union of Evangelical Churches in 2003.The Calvinist (Reformed) and Lutheran Protestant churches had existed in parallel after Prince-Elector John Sigismund declared his conversion from Lutheranism to Calvinism in 1617, with most of his subjects remaining Lutheran.However, a significant Calvinist minority had grown due to the reception of thousands of Calvinists refugees fleeing oppression by the Catholic Counter-Reformation in Bohemia, France (Huguenots), the Low Countries, and Wallonia or migrants from Jülich-Cleves-Berg, the Netherlands, Poland, or Switzerland.
In 1808 the Reformed Friedrich Schleiermacher, pastor of Trinity Church (Berlin-Friedrichstadt), issued his ideas for a constitutional reform of the Protestant Churches, also proposing a union.
Under the influence of the centralising movement of absolutism and the Napoleonic Age, after the defeat of Napoléon I in 1815, rather than reestablishing the previous denominational leadership structures, all religious communities were placed under a single consistory in each of the then ten Prussian provinces.
This liturgical agenda was the culmination of the efforts of his predecessors to unify these two Protestant churches in Prussia and in its predecessor, the Electorate of Brandenburg, becoming later its core province.
Major reforms to the administration of Prussia were undertaken after the defeat by Napoléon's army at the Battle of Jena-Auerstedt.
This differed from the old structure in that the new leadership administered the affairs of all faiths; Catholics, Jews, Lutherans, Mennonites, Moravians, and the Calvinists (Reformed Christians).