The core religious error.

If there is a God, such an entity would be infinitely unsympathetic to human concerns. It would fully understand all human feelings from every angle. Our moral problems and values would be mere mechanics to it.
Most possible minds WOULD worry somewhat about the condition of minds below them in the hierarchy of complexity, for the simple reason there would exist still higher minds, who might treat them the same way they treat lower ones.
However, there can be no higher mind than God. For that reason we should not expect the slightest sympathy from it.
This could provide the basis for a dark religion. The world is basically bad so God must be evil.