Dear Alex,
God is pure act with no potentiality and all activity attributed to God is part of His One Eternal Act of Being. Things play out in time and space in our perspective, being temporal limited creatures, but from God's eternal perspective it is different.
A good read on the nature of God is Aquinas' Treatise on God in His Summa Theologica.
You can find it here:
Check out questions 2 to 43.
Peace,
Paul
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