Jacksonville has a diverse religious population. The largest religious group is Protestant. According to the Association of Religion Data Archives (ARDA), in 2010 the Jacksonville metropolitan area had an estimated 365,267 Evangelical Protestants, 76,100 Mainline Protestants, and 56,769 Black Protestants, though figures for the latter were incomplete. There were around 1200 Protestant congregations in various denominations. Notable Protestant churches include Bethel Baptist Institutional Church and First Baptist Church, whose congregations separated after the Civil War and which are the city's oldest Baptist churches. Each has become very large. The Episcopal Diocese of Florida has its see at St. John's Cathedral; the current building was completed in 1906.