LOL! The leader you are referring to is not a Roman Catholic, but a “Greek Catholic,” as the Orthodox commonly refer to themselves. Go ahead and lecture the Greek about his Church’s ignorance of Greek.
I wouldn’t’ve said, “Christianity is not submission to God,” but what the author meant is that the Christian’s relationship to God is entirely different to the mere abject submissiveness of the Muslim.
I see a lot of folks post stuff without benefit of the Greek.