Keeping them will sooner or later undermine the foundation of the cultivation system, transforming all living beings in the world into followers who have lost their sense of self.
"Ordinary people maintain a superficial faith, which doesn't have much effect, but those true followers, who wholeheartedly serve the Divine Spirits, willing to sacrifice everything for them, belong to the category of fanatics, in the terms of Blue Star. Such individuals can perfectly align with the will of the Divine Spirits, becoming a part of the Will of All Living Beings, whereas those who doubt or are not firm do not meet the conditions to merge into the Will of All Living Beings."
This is why, followers are considered another type of life form.
Likewise, it's also why even powerful Demigods often have followers only in the billions, rather than ruling over one world after another.
Common believers, today worship this god, tomorrow that immortal.
