Thesis
The existence of evil does not constitute evidence against the existence of God. On the contrary, it constitutes a condition without which God could not be God, and hence could not exist.
Argument
The conditions necessary for the possibility of an object existing do not contradict those necessary for the possibility of understanding the concept of that object:
Therefore, the conditions necessary for the possibility of a god existing do not contradict those necessary for the possibility of understanding the concept ‘God’.
But a standard condition assumed necessary for the possibility of god’s existence, namely, a world in which there neither was nor can be any evil, is one in which it is impossible to grasp the concept ‘god’.
Therefore, a world in which there neither was nor can be evil is not a condition necessary for the possibility of god’s existence.
Exposition
The condition of a world in which in which there neither was nor can be any evil is one in which it is impossible to grasp the concept ‘God’. That is, a world in which it is possible to grasp the concept ‘god’ is one in which there was or can be evil.
Proof: I am not concerned here with more philosophical definitions of God, but with a simple one present in every popular theistic religion: by a god, I mean a being to which one should pray. The two chief forms of prayer are petition and gratitude. Petition presupposes the possibility of deprivation. Gratitude presupposes the avoidance of possible deprivation. Deprivation is evil. Without evil, there is thus no concept of prayer; without prayer, no concept of God. Thus, the existence of evil cannot constitute evidence against the existence of God, as a matter of principle.
Corollaries
Eternity is not, strictly speaking, a world distinct from this. If the saints give thanks, it is because they have known evil. If they petition, it is because evil is possible.
The formulation of problem of evil requires some distance from evil itself. This is empirically confirmed by the growth of atheism in proportion with material comfort, i.e. the existence of atheism as essentially a bourgeois phenomenon.
God is called a father, as one who supports and protects; one in heaven, for the altogether simple reason that that is whence the sun and rain come, without which there is no life.