Hilbert's Hotel: a philosophical thought experiment demonstrating the impossibility of an actual infinite series — recommended as a resource.

Hilbert's Hotel (a thought experiment by mathematician David Hilbert) shows that an actually infinite set of discrete, equal units leads to logical paradoxes — therefore an infinite number of gods going backwards in time is impossible. God's infinity is of a different kind: it is an infinite quality of his nature, not a countable infinite series.