If there is such a thing as absolute moral law, then it really has to be absolute, meaning God isn't exempt from it.
That's a big "if". How would you go about showing that there is one moral law to which both man and God are accountable? And what does it even mean to hold God accountable to something? God is existence itself. Surely you cannot undo existence. The best you can do is close your eyes and pretend it has gone away.
And the God you refer to is guilty of multiple genocides.
And you're right back to the "in my opinion God is evil" accusation. But you don't have anything behind it other than your notions of good and evil. Your notions of good and evil are, in part, formed by nature's use of the iterated prisoner's dilemma to ensure some cooperation between individuals where extended cooperation is necessary for raising young. This, in turn, drives the notion that God must (in some way) cooperate with man. When He doesn't, He offends our moral sensibilities. The problem with this is that God does not need our cooperation, so it's a mistake to think that He has to follow our rules.
If he exists, then it is mankind's duty to find him and drag him to Le Hague for trial.
And then what?