Like I said, "tribalism" has little to do with religion per se; it's an mindset ideology that claims paramount importance for that person; it puts their sense of "tribe" at the core of their self-identification belief system, with a need to promote & defend it, at the expense of & very often, enmity to all "Outsiders".
Morrissey tribal instinct seems to be of European & White, and probably regards the Settler State as a representative outpost of white superior European values & ideals, surrounded by inferior cultures of non-white races, and therefore automatically & unconditionally champions it.