Bradskii:
So the universe exists. Let’s say that it was caused to exist by something. Let that something be X. You are saying that X, having caused the universe to exist, still exists in itself.
Premise 1. Physical reality either began to exist or is dependent for it’s existence on a being that necessarily exists. We can know this because physical reality changes and a necessary act of reality does not…
I admit that perhaps the first premise can seem a bit enigmatic. But if a thing is contingent, that contingency can only be resolved by something that necessarily exists. Of course, some physical process may have caused the universe that is not necessarily real, but eventually you have to admit to the existence of that which is necessarily real.
I am happy to rephrase the first premise.
Premise 1: Physical reality is contingent. We can know this because physical reality changes and a necessary act of reality does not. We cannot have a state of affairs where only contingent beings exist, and therefore physical reality and any contingent thing is ultimately dependent on the existence of a necessary-being in order to exist.