I would say and believe that nothing created God, the God head (father, son , spirit) has always existed. He is the first caused, uncaused. John 1 is the first scripture that comes to mind and I will search for more. Now it is important not to think of God caught in our parameters of time. He lives outside of our time and when he created the universe he entered into this time space he created. But ultimately he is outside of time and the idea of a beginning doesn't hold to him. Here is link to a better explanation than I can give.