On the question of "What is God" we can read these two responses:
Jonathan Edwards
The Creator of the world is doubtless also the Governor of it. He that had power to give being to the world, and set all the parts of it in order, has doubtless power to dispose of the world, to continue the order he has constituted, or to alter it. He that first gave the laws of nature, must have all nature in his hands; so that it is evident God has the world in his hands, to dispose of as he pleases. . . .
And it is manifest, in fact, that God is not careless how the affairs and concerns of the world he has made proceed, because he was not careless of this matter in the creation itself; as it is apparent, by the manner and order in which things were created, that God, in creating, took care of the future progress and state of things in the world.
D. A. Carson
It is spectacularly wonderful to talk about God, to think about him. There cannot be any higher subject. But the word God itself is not an empty cipher. Just because somebody uses the word God and then somebody else uses the word God, it does not follow that they mean the same thing. God, for some, is an inexpressible feeling, or it’s the unmoved cause at the beginning of the universe, or it’s a being full of transcendence. But we’re talking about the God of the Bible, and the God of the Bible is self-defined. He talks about himself as being eternal and righteous. He’s the God of love. He’s the God of transcendence; that is, he’s above space and time and history. Yet he is the immanent God; that is, he is so much with us that we cannot possibly escape from him. He is everywhere. He is unchangeable. He is truthful. He is reliable. He’s personal.
What’s really important to see and understand, as God has disclosed himself not only in words but in the whole storyline of the Bible’s narrative, is that we are not permitted to take one attribute of God and make everything of it. We cannot, let’s say, take his sovereignty and forget his goodness. Or take his goodness and forget his holiness (his holiness is what makes him the God of judgment). Or take his judgment, even the severity of his judgment, and forget that he’s the God of love, the God who has so much loved even his rebellious creatures that ultimately he sent his Son to bear their sin in his own body on the tree.
In other words, to get to the heart of who God is and to bow before him in some small measure of genuine understanding, it’s important to think through what the Bible says again and again and integrate the whole with the same balance and proportion that Scripture itself gives. That calls us to worship. And if we put anything else in the place of God, that is the very definition of idolatry.