Dustin

“Concern for one's political community is, of course, right and proper, and
Christians can hardly be faulted for wishing to correct their nation's deficiencies. At the same time, this variety of Christian nationalism errs on at least four counts. First, it unduly applies biblical promises intended for the body of Christ as a whole to one of many particular geographic concentrations of people bound together under a common political framework. Once again this requires a somewhat dubious biblical hermeneutic.
Second, it tends to identify God's norms for political and cultural life with a particular, imperfect manifestation of those norms at a specific period of a nation's history. Thus, for example, pro-family political activists tend to identify God's norms for healthy family life with the nineteenth-century agrarian family or the mid-twentieth-century suburban nuclear family. Similarly, a godly commonwealth is believed by American Christian nationalists to consist of a constitutional order limiting political power through a system of checks and balances, rather than one based on, in Walter Bagehot's words, a "fusion of powers" in the hands of a cabinet responsible to a parliament. Thus Christian nationalists, like their conservative counterparts, tend to judge their nation's present actions, not by transcendent norms given by God for its life, but by precedents in their nation's history deemed to have embodied these norms.
Third, Christian nationalists too easily pay to their nation a homage due only to God. They make too much of their country's symbols, institutions, laws and mores.They see its history as somehow revelatory of God's ways and are largely blind to the outworkings of sin in that same history. When they do detect national sin, they tend to attribute it not to something defective in the nation's ideological underpinnings, but to its departure from a once solid biblical foundation during an imagined pre-Fall golden age. If the nation's beginnings are not as thoroughly Christian as they would like to believe, they will seize whatever evidence is available in this direction and construct a usable past serviceable 34 to a more Christian future.
Fourth, and finally, those Christians most readily employing the language of nationhood often find it difficult to conceive the nation in limited terms. Frequently, Christian nationalists see the nation as an undifferentiated community
with few if any constraints on its claims to allegiance. 45 Once again this points to the recognition of a modest place for the nation, however it be defined, and away from the totalitarian pretensions of nationalism. Whether the nation is already linked to the body politic or to an ethnically defined people seeking political recognition, it must remain within the normative limits God has placed on everything in his creation.”
― David T. Koyzis, Political Visions & Illusions: A Survey & Christian Critique of Contemporary Ideologies