This was the core reason the Church could dominate the continent.
Previously, they had attempted to attack an Evil God with 7000 prayers and the chosen ones using Arcane Railguns, optical weapons, and the end bombs, but in the end, they had almost not caused any damage.
So much so that they even doubted the Extraordinary Knowledge they had studied for so many years was false, that there really was no power in this world that could penetrate the Mobile Church, and the deities were truly as the major churches proclaimed, letting their loyal followers shepherd the human world on behalf of the deities.
They did not care about anything, because they were the symbols of power and authority.
Later, my mentor committed suicide by shooting himself, just as you said, that a perfect defense against all attacks, such as the Energy Barrier, should not exist. Even for a Mage, to protect against specific attacks, they need to use professional skills.