Theists will try to counter this argument by saying that God doesn't require a cause, but is self-caused. Therefore God does not exist because by nature he is either unnecessary or because he is self-denying. Both disprove the existence of God. The law of necessity states that God, by definition, is a necessary being. However, the atheistic argument is that no statements about existence are necessary.
Existence is just existence.
Therefore nothing can exist necessarily. Therefore, the only way God could exist is the very way he can not exist. Disproofs from the Moral Law Atheists claim that an all-powerful God is inconsistent with a completely just God. The basis of this claim comes from the observation that injustice or evil exists. Because injustice exists, either God does not have the capacity to end injustice, which disproves his omnipotence, or he lacks the willingness to end injustice, which disproves his justice.