God help (one)
A phrase used to acknowledge that one is in or could potentially be in trouble. If I have to go down that basement, which is full of spiders, Gold help me. Well, God help you if mom finds out that you're the one who broke her vase.
God/Heaven ˈhelp somebody
(spoken) used to say that you are afraid somebody will be in danger or that something bad will happen to them: God help us if this doesn’t work.(Some people find this use offensive.)