Though I would say what caused Busto to ask Creed to step down had very little if anything to do with faith. Once again that is going from what was said in the realm.
It was not directly related to SA. It was an incident that happened in the Dwilight University.
And so it is acceptable for a member of SA and ruler of a realm who was ex regent of SA to be arrogant but not for a master swordsman and marshal who is not of the SA faith?-
Master swordsmen are a dime a dozen. All it takes is gold and free time.