“Calvin’s principle of separation of church and state bore little resemblance, however, to modern American understandings of a ‘high and impregnable law between church and state.’ Despite his early flirtations with radical political implications of the two kingdoms theory, Calvin ultimately did not contemplate a ‘secular society’ with a plurality of absolutely separated religious and political officials within them. Nor did he contemplate a neutral state, which showed no preference among competing concepts of spiritual and moral good. For Calvin, each community is to be a unitary Christian society, a miniature corpus Christianum under God’s sovereignty and law. Within this unitary society, the church and state stand as coordinate powers. Both are ordained by God to help achieve a Godly order and discipline in the community, a successful realization of all three uses of the moral law. Such conjoined responsibilities inevitably require church and state, clergy and magistracy to aid and accommodate moderate each other on a variety of levels. These institutions and officials said Calvin, ‘are not contraries, like water and fire, but things conjoined.’ ‘The Spiritual polity, though distinct from the civil polity does not hinder or threaten it but rather greatly helps and furthers it.’ In turn, ‘the civil government has its appointed end…to cherish and protect the outward worship of God, to defend sound doctrine of piety and the position of the church…and a public manifestation of religion.’
Calvin’s principles were as much reminiscent of medieval forms of church-state relations as prescient of modern forms. To be sure, Calvin anticipated a number of modern concepts of separation, accomodation, and cooperation of church and state that later would come to dominate Western constitutionalism. But Calvin also appropriated many of the cardinal insights of both the ‘two powers’ theory of Pope Gelasius and and the ‘two swords’ theory of the Papal Revolution. Particularly like his medieval predecessors, Calvin saw that to maintain its liberty, the church had to organize itself into its own legal and political entity, and to preserve for itself its own jurisdiction and responsibility. It had to wield its own ‘sword,’ maintain its own ‘power.’ Calvin differed from his medieval predecessors, however, in insisting on a more democratic form of ecclesiastical and civil polity, a more limited ecclesiastical jurisdiction, and an equality of church and state before God.”
John Witte, Jr.
The Reformation of Rights pg. 76
Now what we are clearly seeing is that Calvin did hold to something that could be called a ‘Two Kingdom Theology.’ However what Calvin developed was far different than what Luther held to and what Westminster West Seminary is trying to sell with their radical two Kingdom Theology. Compared to Luther and Westminster West (which on this score is trying to Lutheranize Calvinist theology) Calvin’s two Kingdom theology is far more nuanced and subtle then the dichotomizing theology evidenced in Lutheran and Westminster West theology. Calvin’s theology eschews pagan pluralism, and embraces the idea of a kind of feudally arranged Christendom, where, because the individual parts that comprise the whole are organized as a Christian community, the whole therefore can be denominated ‘Christendom.’