The universe began to exist;
You don't know that.
Contrary to popular belief, big bang theory is not a theory concerning the
origins of the universe. Instead, it attempts to explain the
development of the universe, starting at Planck Time: the first "moment" of the universe. Which is the lowest possible time "unit"
after T = 0.
"before" that point, our knowledge of physics breaks down.
So, really, for all we know, big bang theory simply describes a state-change of something that already existed.
I'm happy to move forward with the idea that it "began to exist" though, for sake of argument. Just remember that there is a red flag here...
everything which begins to exist has a cause
Seems like a statement that you don't know either. Can you even know this? Whenever a truth claim is done that mentions the word "everything", or "nothing" for that matter, again a red flag is waving...
Have we investigated every there is to investigate? No? Then how could you possible "know" that this rule applies to EVERYTHING? Including thus, all the stuff that we have NOT investigated? That we don't know even know about, at all?
Also, even among the things we actually HAVE investigated, particularly in quantum mechanics, there most certaintly are processes there, which puts a question mark to this second premise. There sure is weird stuff going on in the quantum world, many of which completely challenge our intuition and "common sense". And yes, there are quite some types of events that really do question the universality of phenomena like causality.
; therefore the universe has a cause.
2 problems with this one...
First, obviously, a conclusion can only be as good as its premises. Since the premises above are problematic and basically not in evidence, the conclusion is off the same category: problematic.
Second.... there's a category jump here. Premise 2 necessarily talks about stuff IN the universe. It couldn't be talking about something else, because stuff IN the universe is the only stuff that we can actually observe and study.
I could state now, by the way, that IN this universe, nothing really "begins to exist" (conservation laws and all that), but anyway....
The point is that the universe
itself is a very different beast as opposed to the stuff
in the universe.
There is absolutely no reason to assume that physical laws/rules/principles/phemona that we observe IN the universe, will also apply to the universe itself.
In fact, it would be very irrational to assume so... for the simple reason that the physical laws are literally dependend on the universe. They are dependend on an expanding space-time and the physical constants
of the universe.
So to be able to make statements about the origination of the universe, you would have to know in what kind of environment a universe can originate.
You can't take physics as it applies
in the universe and then pretend that the exact same physics apply to the universe itself.
That simply makes no sense at all.
So, in conclusion, I think this argument is extremely bad and wrong in a multitude of ways.
A part cannot explain or cause the whole; a part of the universe cannot cause the universe; therefore something which transcends the universe caused the universe.
Causality is a physical phenomena wich results from physics as it applies in the space-time continuum. By its very definition and its dependencies, it is invalid to invoke it in a setting where there is no such space-time continuum.
So we arrive at an immaterial cause that transcends the universe
Actually, we just arrive at invalid conclusions based on false premises and ignorance.
I guess we don't have to call it God if you really dislike that name. This obviously provides a measure of explanation via the syllogisms; to deny this is to arbitrarily define "explanation" as excluding certain kinds of causes.
You don't have any explanations or arguments.
All you have here, are fallacies. sorry.