Acts 17:26-27 ESV
And he made from one man every nation of mankind to live on all the face of the earth, having determined allotted periods and the boundaries of their dwelling place, that they should seek God, and perhaps feel their way toward him and find him. Yet he is actually not far from each one of us.
There’s your Christian Nationalism. Groups like The Gospel Coalition are not arguing with people of today, but with Apostles under the inspiration of God. Will there one day be one people made up of every tongue, tribe and NATION? Yes. The consummation is not here. Until then, we call people of other nations our brothers and sisters in Christ, co-heirs of a Kingdom, but not yet of the same Earthly nation.