I think this misconstrues what a Malkioni School is. School is not used as a substitute for faith or creed but in the sense of a philosophical school. The only people who would be properly be said to belong to a school are the wizards. Everybody else are their supporters and retainers. The non-wizards may learn spells, they may believe in an Invisible God (or not) they may follow whatever philosophical guidance their wizard gives (Don't worship Saints! Don't worship Gods neither! And absolutely no spirits!!) but they leave the heavy duty of thinking about Big Stuff to the wizards.
A Rokari merely means a follower of the Philosophical Tradition begun by Rokar. They will not primarily identify themselves as Rokari. They would be more likely to describe themselves as a man of Seshneg. If pressed, they might refer to themselves as a worshipper of the Invisible God Makan (while looking confusedly at the nearby wizard who just received a massive headache). If pressed to identify the schools of Malkionism, they would pump for the Malkioni (us), joyful degenerates (Hrestoli), dirty stinking pagans (Arkati) etc.