Reverend Ed is discussing separating the our allegiance to God from our allegiance to any nation-state. He has suggestions for how to make the dichotomy clearer.
While I'm not going to spout "Christian nation" rhetoric, I'm not sure if I completely agree with him on all points. There are old testament examples of Jews operating in ungodly societies like the Books of Daniel and Esther. Both set the precedent that a Jew (or a Christian by inference) should support his nation unless it takes a position diametrically opposed to the will of God such as idolatry or denying religious liberty. This is the same theme that is reiterated in Paul's writings on the subject.
In the end, we should seek to have God and Country. But as the good reverend says, God is before Country and over country. God comes first. I agree that this fact should be hammered home in our churches.