Proto-Protestant supplies perspective.
First, Anabaptists are out:
Westminster West’s Two Kingdom theology breaks at points with the Lutheran variety and is certainly somewhat hostile to Theonomy and yet its retention of Kuyperian Dominionism places it much closer to the Lutheran and Theonomist understandings of the Kingdom than it does to the Anabaptist. Westminster’s version of Two Kingdoms is still very much pro-culture formation and while not Transformationalist in a de jure sense, from the standpoint of ‘radical’ Two Kingdom theology it represents a de facto rejection of Two Kingdoms.
The Anabaptist position if we are to accept that unfortunate label would identify both the Lutheran and Westminster West (or Escondido) positions as being One Kingdom with different nuances and not genuine expressions of Biblical Two Kingdom theology. From my standpoint it’s just a diluted (and thus somewhat improved) One Kingdom or Sacralist understanding of the Kingdom.
Second, Lutherans are as 1k as Kuyperians and theonomists:
Cooper is to be commended in some aspects of his presentation and argument. He does a great job demonstrating the actual Sacralist (One Kingdom) nature of Lutheran so-called Two Kingdom theology, a point I’ve been trying to make for many years. He intimately weds it to the Magisterial Reformation. His proper explanation of Lutheran Two Kingdom theology demonstrates that the charges made by Theonomists regarding its equivalence with the Anabaptist version are completely false.
For example whenever the Theonomists wish to attack what they call Radical Two Kingdom theology they will pin the indifference and acquiescence of the German population in the 1930s on their embrace of Lutheran Two Kingdom theology. Two Kingdom theology led to separatism (it is argued) and passivity. And thus the German Church and people let the Nazis come to power.
And then when Westminster Two Kingdom advocates point to Lutheranism as an example of a Two Kingdom Reformation heritage, and that their view is not guilty of novelty, the Theonomists will suddenly argue that Lutheran Two Kingdoms is more akin to their own Sacralist and Established Church position. They will then argue the Escondido variety is actually a version of Radical Two Kingdom theology.
In other words, the fundamental difference between magisterial and Anabaptist Protestants is that the former do not reject the state or the sword as legitimate spheres for Christians. (Not to mention that magisterial Protestants don’t question Christendom until 1789.)
Third, theonomists lie:
As usual the Theonomists have little interest in the truth of the matter and wish instead to destroy their intra-denominational opponents. Their historical theology is politicised and that’s something that always needs to be recognised when dealing with the Christian Right.
The politicisation of theology can be frustrating but Cooper makes it exceedingly clear. The Lutheran view has a very positive attitude to the state and in reality its model can be described as One Kingdom in two spheres… very much like the Kuyperian model embraced by Westminster West.
Finally, what went wrong in Germany (it wasn’t 2k):
This further demonstrates a point I have often made that it was the Sacral Theology of German Lutheranism that taught moral complacency, compliance and social conformity. They lost their sense of antithesis and equated German Kultur with Christianity. Hitler’s nationalism and anti-communism were sentiments they readily identified with. The German Church didn’t embrace Nazism due to passivity. Rather they (speaking in general terms) actively embraced it, viewing nationalism and political anti-communism (not to mention anti-Semitism) as expressions of piety and Christian culture.
True advocates of Two Kingdom theology are governed by antithesis and would never be taken in by or support such agendas. This is not to blame or slander Lutherans for what happened under the Third Reich but it helps to understand why an ostensibly ‘Christian’ nation would embrace a figure like Hitler and the agenda of his regime.