Religious factions fight. You can not force people into a belief system. Roman Catholics did some horrible stuff during the Inquisition, but it didn’t stop the Protestants from splitting off. Protestant still fall under the cross, even after the evils f the Inquisition.
My diagram can’t capture all the links between the religious faction nor fit in all the religions, but I needed to rough draft a concept. A major theme in my novel is factions, but my use will differ than my diagram. I may still use the enneagram, but the symbols will change.
The hamsa.is a hand shaped symbol the still appears in the Middle East and North Africa and dates back to ancient Mesopotamia; it fits in well with my novel because the fingers represent the Dactyls who link to my Cabeiri Cult.