1. The nonexistence of a perfect God is ultimately inexplicable.
2. No part of reality is ultimately inexplicable.
3. If (1) and (2), then it is not the case that a perfect God does not exist.
4. Therefore, a perfect God exists.

Note that a mere argument for the nonexistence of a perfect God does not necessarily qualify as an ultimate explanation of the nonexistence of such a God. Consider the following argument:

1. If evil exists, then God does not exist.
2. Evil exists.
3. Therefore, God does not exist.

Since this argument offers us no explanation of why evil exists, it fails to provide us with an ultimate explanation of God’s nonexistence.