Why can’t I argue that God exists noncontingently and is an abstract object?

Why can’t I argue that God exists noncontingently and is an abstract object?

Why can’t I argue that God exists noncontingently and is an abstract object? Some say it is because abstract objects lack causal power, and thus to argue as such would deny God at least one essential characteristic which any interesting concept of God cannot lack—omnipotence. But why can’t abstract object possess causal power?

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