Found this old essay. Found it on point. Chad Docterman: Why the Christian God is Impossible Introduction Christians consider the existence of their God to be an obvious truth. This assumption is false, not only because evidence for the existence of this presumably ubiquitous yet invisible God is lacking, but because the very nature Christians attribute to this God is self-contradictory. Proving a universal negative Many Christians, as well as atheists, claim that it is impossible to prove a universal negative. For example, while we may not have evidence that unicorns or dragons exist, we cannot prove that they do not exist. Unless we have a complete knowledge of the universe, we must admit the possibility that somewhere in the universe, there might be such creatures. But the claim that omniscience is needed to prove a universal negative presumes that the concept which we are discussing is logically coherent. If the attributes which we assign to a hypothetical object or being are self-contradictory, then we can conclude that it cannot exist, and therefore does not exist. I do not need a complete knowledge of the universe to prove that cubic spheres do not exist. Such objects have mutually-exclusive attributes which make their existence impossible. A cube, by definition, has 8 corners, while a sphere has none. These properties are completely incompatible -- they cannot be held simultaneously by the same object. I intend to show that the supposed properties of the Christian God Yahweh, like those of a cubic sphere, are incompatible, and by so doing, to demonstrate that Yahweh's existence is an impossibility.