This is the story of a crazy lich who possesses an internal game system and brings catastrophe to the entire world. “Let’s look at the daily quests today… it’s the damned choose one-of-two-options-type again. Destroy a town with a population of 30,000 people or above; reward: 10,000 evil points. Steal lollipops from 3 children; reward: 1 evil point. If neither of the quests is completed, then 2 points will be deducted.” “Tsk! You think I’m stupid? If I really destroyed a town, a crusade of Myth-ranked Holy Knights would definitely come hunting me down. Even if I earned the points, there wouldn’t be any life left in me to spend them. I better just go be a kindly lollipop bandit.” I’ve already had enough of being a notorious lich. Who says a lich can’t be a good person? I’m definitely going to beat this damned system and be an upright and dignified good man.
Any religion would loath heretics far more than any other enemy. Traditionalists would feel that the heretics' explanations of doctrine and new inventions would cause the religion to lose its "purity and tradition," needlessly confusing loyal believers.
An analogy would be the most frightening disease back on Earth—cancer. Ordinary cells would mutate and spread at a scary rate. Once the changes within one's body spread to a certain degree, it would be impossible for that person to remain alive. For the ones who battled and defeated cancer, it would put great strain upon their body.
In this world of True Gods, heretics were those with different understandings and explanations of the True Gods' teachings. This could cause changes in a Divine Concept or people's belief.