Taking the first question first, on a Plantinga-style approach, it makes no sense to say that God is identical either to existence or to his existence. For Plantinga, existence is a first-level property that everything exemplifies. Given that “exemplifies” picks out a two-term irreflexive and asymmetrical relation, God cannot be identical with existence. Nor can God be identical to his existence. The latter is presumably a state of affairs, an abstract object, and no concretum can be identical with an abstractum on pain of violating the separateness of the concrete and abstract realms. There a...