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Ecclesiology is the study of the church, encompassing its theological doctrine and, in some contexts, its architecture and adornment. In Christian theology, the church is understood as the community of believers, often described as the body of Christ or the people of God. This concept has evolved over time, with early definitions focusing on external, juridical terms and later ones emphasizing inner, spiritual reality.123

The Christian church traces its origins to Jesus Christ and his followers. Historically, the church has faced divisions, notably the East-West Schism and the Protestant Reformation, leading to various denominations. Despite these divisions, many Christians believe in the church's essential unity, often referred to by the marks of "one, holy, catholic, and apostolic". The ecumenical movement seeks to foster unity among different Christian bodies.3

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