God is not a concept, or an idea, but a Person. He is not defined by the attributes that He has, but they are defined by Who He is. The question "What is God" assumes that there are attributes which can be abstracted and separated from His nature. The question should be "Who is God?" or "What is God's identity?"
It is like asking the question "What is "FadingW" as a concept?" It is a category error - you are not a concept, but a Person.
It is like asking the question "What is "FadingW" as a concept?" It is a category error - you are not a concept, but a Person.