I think one of the most egregious errors of the early theologians is the idea the church and state should be together and function as one. It results in the spiritual being manipulated to produce political power and then political power being used to enforce "right thinking".
Amen. Calvin’s articulation of a separation of church and state is what founded this country. The state is to protect the church, not eradicate it. The church is to guide the state, not define it.