If psychological continuity is itself the criterion of personal identity, then God's sustaining activity is at most causally enabling, not constitutively grounding, of that criterion.

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Causally enabling(as used in metaphysics and philosophy of causation): Providing the conditions that make something possible to happen, without directly creating or determining it — like how oxygen enables fire but doesn't constitute what fire actually is.
Constitutively grounding(as used in metaphysics): Actually making up or forming the fundamental basis of something — like how hydrogen and oxygen constitute (make up) water itself.
Criterion of personal identity(what aggregate-causation is supposed to be): A rule or test that philosophers use to decide whether someone at one time is the same person as someone at another time.
God's sustaining activity(as used in philosophy of religion and theology): In theology and philosophy of religion, the idea that God continuously maintains or upholds the existence of the universe and everything in it, rather than just creating it once and letting it run.

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