It is very common for arguments about the Existence of God to start by the Believer being asked to define the God that they want to discuss. So, for example, God might be defined as.. "The Creator of the Universe" Lots of other things are defined. In the game of Chess, for example, the 'allowed moves' are defined. In mathematics, the operators are defined. But in the natural sciences, most things are described, not defined. You don't define an elephant, you describe it. Even here, people like to define things, such as Species, Kingdoms etc. although such definitions are difficult because the natural world is not so clear-cut as one would like and is often fuzzy at the edges. A horse is not the same as a donkey, but what is a mule? Once we define something, we tend to think it is a real thing. But it isn't. There is no such thing as a fish. Suppose I define God as the Creator of the Universe, then ask the following... Was the Universe created? If so, who created the Universe? Answer = God. So I have defined God into existence. You cannot describe God, because it isn't available for examination. Suppose you claim that your god is a tree. You may point at a tree and say, "That is Puliyidaivalaiyamman". I say you are pointing at a tree.