Arguments for God’s “actual existence” equivocate on what “exist” means.
This might be somewhat Wittgensteinian but I assure you it's my own thoughts.
A concern that "God exists" arguments can begin to resemble claims about conceptual or abstract existence more than claims about actual existence in the ordinary sense, is a very real concern.
Normally, we distinguish between:
- Things that exist as concepts, abstractions, or objects of thought
and
- Things that exist independently of thought as actual things a part of this reality.
What allows us to make this distinction is usually some combination of causal interaction, empirical/temporal accessibility, explanatory indispensability, or the ability for a thing to constrain experience independently of our conception of it.
However, many apologetic arguments (especially Abrahamic ones) conclude with a God whose existence is said to be:
- Outside space and time,
- Non-material,
- Non-contingent,
- Inaccessible to ordinary empirical investigation.
At that point, the distinction between:
- God exists as an actual being
and
- God exists as a concept or abstract being
Becomes philosophically unclear, because the ordinary criteria by which we separate actual existence from conceptual/abstract existence no longer seem applicable.
This does not prove that God is merely conceptual or that the assertion is that God must be empirically/scientifically accessible. Rather, it raises the question of what modes/methods remain for distinguishing existential claims of actuality from claims about abstract or conceptual entities.
To me things look very similar to a Motte-and-Bailey styled presentation of "exist" at the end of arguments for God. Where the most of common understanding of "exist" is assumed, but when pressed on clarification on this existence, it gets swapped out for a different type of "exist" that doesn't share those same properties and is arguably indistinguishable from abstraction and purely conceptual. Hence the equivocation.
In other words:
To avoid equivocation; If a purportedly actual being lacks the features that ordinarily differentiate actuality from abstraction, then additional justification seems necessary to explain in what sense the being is said to "actually exist" rather than merely conceptually.