The Principle of Contingent Causation: The Impossibility of Infinite Regress.

[Angrboda]

Not actual infinites formed by successive addition.

Some think actual infinites exist in the mind of God.

The Wiki link says: "One proof is based on the notion of God. First, from the highest perfection of God, we infer the possibility of the creation of the transfinite, then, from his all-grace and splendor, we infer the necessity that the creation of the transfinite in fact has happened. (G. Cantor [3, p. 400])"

The successive addition bit is a red herring as an infinite past wasn't formed by successive addition. How many times do we have to repeat this before it penetrates your rock-hard skull?