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As one type of relationship between church and state, a state church is a church incorporated into the state in such a way that it appears to be a state institution. As a result, the state not only has the right to intervene in the internal governance of the church (staffing, deciding doctrinal conflicts, disposition of church property, etc.; Church polity) but also may use the church for state purposes.
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The history of state churches began when Theodosius I made the Christian church the only recognized church of the Roman Empire (R…