In the redeemed humanity, Christ rules over all things, state and church included.
My two cents
I like the postmillennial overtones of this statement. Christ rules over all things, including politics. All authority has been given to him—in heaven and on earth—millennia ago. This includes political and civic authority.
If there’s such a thing as a pickup line that men can try on single postmillennial/theonomic women, I think this would be it. Maybe some premillennial women would like it too. Ascension Jesus heaven resurrection
Rushdoony, R.J. (1968). The Foundations of Social Order: Studies in the Creeds and Councils of the Early Church. Fairfax: Thoburn Press. p. 73.