can say God is wrong

Christian God is a "speaker" with some extra power. He is just a "speaker."If he is wrong, I still can say he is wrong; regardless the super duper power he has. Because the power and ability are irelevant with rightiousness. If some stupid moron said rightious thing , and if I felt that is rightious words, I have to say "he is right" because the power, ability, and social status are irelevant with rightiousness. I say killing is bad. killing of babies are bad. killing of all people in the world except 1400 cherry boys are wrong Bible maybe true and I may not be able to avoid those things. but I still can call him wrong. I can.

Because the power and ability are irelevant with rightiousness...I still can call him [God] wrong.

Surely you "can" say anything you want. But that is not what you are trying to say here. You want to say that a human being can morally judge even his creator, God, as being "wrong" when He does such thing as "killing of babies."

I disagree. If God is like one that the Bible describes, then He is a lawgiver and above all laws. It is His will that determines what is good or bad. When you accept the Bible, you accept Him as an absolute monarch who is above the laws; hence, you cannot say Ｈim wrong.