The idea is that the authoritites (all authorities) are ultimately under God's sovereign control, whether they acknowledge Him or not. Compare Proverbs 21:

1 The king's heart is in the hand of the LORD;
he directs it like a watercourse wherever he pleases.
(NIV)

"Vaya con Dios, Castle. Go with God."
"God's going to sit this one out." The Punisher (2004)