Some hours before the battle began, the baron was sitting on the bed as he was looking at his new arms.
The Gauntlets given to him by Zach, he would ask "Why are you helping me?" A valid point since the Baron was not a believer of Zachelius Diavolos and not an elloran.
"Well, Let's just say that I dislike it." Zach turned his face around and faced the baron while saying "Dislike the fact that they are praying to a false God who is used for the purpose of gaining power and ruling."
The baron nodded in agreement for his words were true and the baron clearly knew about that fact since he was a victim.
But the baron still asked "But how do you think I can destroy the church, Won't they at the very least have some secret powers hidden."