“The central tenet is that Jesus Christ is the head of the Church.”
Hey there, you may be a Protestant!
I doubt he accepts most protestant doctrines like "Once saved, always saved" or "Sola scriptura" I think he's actually an Orthodox Christian but doesn't realize it.
Venerates the virgin mary, 7 sacraments, infant baptism, faith + work, "pope is merely the bishop of Rome, speaks for the church as first among equals, and has no special authority to oversee others" = Orthodox Christian.
Nope, nothing to protest.