I don’t necessarily believe that. But it is just as explanative as the idea that God created the universe and that God accounts for his own existence. As I said, it has the advantage of being simpler since we don’t need to assume the universe’s existence; we know it exists already.
The existence of the universe is not a logical deduction from what the universe is. The universe isn’t anything over and above space, time, matter and energy. Since all of these began to exist 13.7 billion years ago, existence isn’t integral to the universe. It could “not exist,” therefore it isn’t true that universe accounts for its own existence. Since existence is not logically entailed by anything about the universe there is no warrant for claiming it explains itself.
No, the Big Bang begins with a singularity. Thus it is assumed that matter (and therefore energy) has always been around, since the singularity had mass.
The singularity is a theoretical construct that, as far as I understand, does not have a temporal component. The singularity didn’t have duration but was rather the “blended” initial state from which space, time, matter and energy derived. It didn’t exist infinitely into past time since time resulted from it.
What properties of God’s do we need to assume to establish his self-sustaining existence? I imagine they would be more complicated than my explanation requires, particularly because I don’t need to assume that the universe is omnipotent, omniscient, omnipresent, omnibenevolent, etc. I just need to assume it’s eternal. Surely that is simpler than the rest combined?
Sure it is. If it’s simpler and explains everything just as well, then why not?
The problem with “simpler” is that the logical requirement for sufficient must still obtain. Why should “simple,” of itself, have the capacity to bring forth a highly structured, highly defined, highly complex universe? How does simple satisfy the principle of sufficient reason? The effect must be explained by the cause. Omnipotent, omniscient Ipsum Esse Subsistens (aka God) posits an immaterial, eternal, self-existent Actus Purus to explain and power all the formal derivatives of matter, energy, space and time.
What does a “singularity” have to offer in terms of creative potential other than it was a pre-existent state? Merely “preceding” does not logically entail sufficiency. How does the singularity actually “explain” the universe as in being “a sufficient reason for” rather than merely “a precursor of?”
An egg does not, of itself, explain the chicken because the egg itself needs to be explained. It is not sufficient to claim the egg is simpler than the chicken, so therefore Occam’s razor eliminates the heavy lifting required by the principle of sufficient reason by cutting out the need to explain anything.