No you make God a sinner if He breaks it. The law is Gods nature. I didn't think this was a controversial thing to say. Saying He is "above the law" is separating God from it, as if the law isn't His very nature. Nobody is saying the law is God, but God is in nature perfect by the laws standard, the law is set by His nature, or the way He is in truth. You can't separate the two, and the way you say it seems to suggest God can transgress His law without having actual "broken it" because He's above it. NO! Just NO! This line of thinking turns God into a tyrannical hypocrite unworthy of any praise or worship. I'm not sure I'm following you here exactly, but if I'm not misunderstanding what you're suggesting here somehow, this is a dangerous line of thinking and worldview, couple this with your extreme view of Gods sovereignty, and you are the perfect candidate for some kind of "I'm chosen to bring this judgement to these people, self righteous holy wrath unleashed" lunatic spree.
No body is saying God must "obey" His law, but you tell me, can He break it? Can God transgress His law? That's what I hear you suggesting.