The most common definition of Christian nationalism is the merging of fleshly and spiritual identities, even to the point where one's fleshly (national) citizenship is on par with that of one's heavenly citizenship. Yet this marrying of the 2 citizenships doesn't take into account the Biblical consequences of heavenly citizenship, in which all other identities (nationality, race, class, sex, etc.) become secondary and so-called obligations to those identities should be renegotiated. Paul insists that kingdom citizenship amounted to a transfer from the kingdom of darkness into kingdom of His beloved Son. (Colossians 1:13) The kingdom of darkness that we once participated in was headed by Satan who wielded his power through people dominated by "the lusts of the flesh, the lusts of the eyes, and the boastful pride of life." (1 John 2:16) The vast majority of people at any given time in history are enslaved to their lusts, so John isn't exaggerating when he contends that "the whole world lies in the power of the evil one." (1 John 5:19) The nation-state is the natural place for the exercise of power by lust-driven, demonically manipulated members of the kingdom of darkness. Since Christians have been transferred from this kingdom into Christ's kingdom, their primary identity is that of kingdom citizens and all secondary identities come under the Lordship of Christ in the process of sanctification. Our national citizenship obligations are renegotiated, rendering us "aliens" (1 Peter 1:1), who partake of Christ's otherworldly kingdom (John 18:36), and "ambassadors" to worldly members of the kingdom of darkness. (2 Corinthians 5:20) Christian nationalism therefore amounts to an insurmountable conflict of interest of 2 opposing kingdoms with completely different goals and means.
