When the enhancement ended and all believers had adapted to their own strength, he asked Afonso to write a proclamation of the Power of Faith Church's crusade against the Holy Church, officially declaring the Holy War between the gods of Life and Wisdom and the Holy God had begun.
The war between churches of different faiths is called a Holy War, which is a conflict that transcends the ordinary. Aristocratic lords can choose to join the Holy War or not, and theoretically, they won't be subjected to retribution after the war.
But this is only in theory; in reality, the aristocrats and lords of Dier Province have little room to choose.
Living on this patch of land, how is it possible to remain uninvolved? The Holy War concerns all believers, and many knights and soldiers under the great lords are followers of the Holy Church. When the Church calls them to arms, if your subordinates go to war and you, as a lord, remain uninvolved, that's hardly possible.