The Muslims understand this definition of nationalism. They even have an acronym for it. That acronym is NOI, which stands for the Nation of Islam. They define the "Nation of Islam" to be all the Muslims throughtout the world, regardless of which country they live in or which country they come for from. Christians need to understand this, and openly unite in the same manner.

Agree. Historically, at least in the Protestant/Reformed tradition, we call it the 'visible church' --

Confession of Faith: The Orthodox Presbyterian Church

We

That's true, we're dual citizens. The secular (temporal) State operates on the principle of Justice / Natural Law and the eternal Church operates on the principle of grace. The two institutions have different means and different ends. Our humanity informs the former, and our Christianity informs the latter. Justice is not a particularly Christian goal or procedure.

I call it the Nation of Christ