The United Church of Christ in Japan is the largest Protestant denomination in Japan. It is a union of thirty-three diverse Protestant denominations forcibly merged by the Japanese wartime government on June 24, 1941. The UCCJ, which is a Japanese Independent Church, is a member of the World Council of Churches (WCC).
United and uniting churches
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A united church, also called a uniting church, is a denomination formed from the merger or other form of church union of two or more different Protestant Christian denominations, a number of which come from separate and distinct denominational orientations or traditions. Multi-denominationalism, or a multi-denominational church or organization, is a congregation or organization that is affiliated with two or more Christian denominations, whether they be part of the same tradition or from separate and distinct traditions.
Glass window in the town church of Wiesloch (Stadtkirche Wiesloch) with Martin Luther and John Calvin commemorating the 1821 union of Lutheran and Reformed churches in the Grand Duchy of Baden.
Unionskirche in Idstein held by the Protestant Church in Hesse and Nassau. It commemorates the union of Lutheran and Reformed Protestants in the Duchy of Nassau in August 1817, the first of its kind and a month before the Prussian Union in September of the same year.