That argument applies to evil powered beings too. If you are unable to recognize a disservice, you also have no way to know when an act is a service or a disservice. The consequence of this is that you can't criticize God's actions on the grounds that they seem evil to humans--but you can't praise them on the grounds that they seem good to humans, either. Maybe he's really evil, wants to harm us, and you just don't understand how what he does goes against your interests.
Does anyone know of an apparently defensible response to the following question?
How does a theist distinguish by any imaginable experience between an omnipotent and loving Being, and an omnipotent Being that just wants you to believe it is loving?
Or, if you prefer:
Out of all potential omnipotent beings that want you to believe that they are loving, what observation can distinguish those which actually are loving?
Also, are any of you aware of another who has posed this question?
EDIT: I'm confused at the apparent disapproval of many. Is it because the question refers to religion?