You just said, the universe as we know it began at the big bang.
The big bang, is what? It's the universe at it's early stages. That's like saying, the universe began to exist, at the early stages of the universe. okay.
Not quite; the universe
as we know it began at the big bang. It's possible the big bang was an evolution of an earlier state.
Something to think about is, why does the universe exist, rather than not?
Assuming you mean that 'why' as '
how' does the universe exist, rather than implying some purpose or intent, I don't think it's possible to answer that. There are plausible physical solutions involving the instability of the quantum vacuum, but that leaves open the question of the origin of the quantum vacuum. We don't know. I'm inclined to think it was a development of an earlier state, but that's just my preference.
As for the phrase, "begins to exist", I don't think you're right in the way you are defining it.
It is not generally understood that beginning to exist exclusively relates to matter and energy taking different forms.
However, let's grant that. We could say that matter and energy were simply in a different form in the non-existence of the universe. The form they were in, was non-existence. They then came a different form form, existence, due to a cause.
This is an acceptable way of thinking of changing forms, non-existence to existence.
It's not acceptable to me . Non-existence isn't a form, it's an absence of form, because it's an absence of
stuff that can have form. If you're suggesting abstract Platonism, that won't help without
stuff to reify it.
Since human consciousness perceiving what it is like to be alive, somehow comes into existence having previously not existed. I think I can speak for most people when I say, human experience of what it's like to be alive, is not a form of matter or energy, even though it may be caused by matter and energy.
Human experience is an aspect of the process that is consciousness. It's a pattern of activity of matter & energy that leaves a physical trace. How is that relevant?
Referring to the phrase began to exist, when speaking of the universe, it is no different from saying a rational mind began to exist.
We know how rational minds begin to exist, we've seen them develop. We don't know how the universe as we know it came to exist, as we weren't there to observe it. So we can't say whether the same or similar principles are involved or not.
Anyways, it seems like you don't think premise 1 is true. It seems like you'd like to maintain premise 1 by creating a very narrow definition especially for beginning to exist when it comes to the universe; but I see no reason to think doing so is correct.
As I said, I don't think 'begins to exist' is well-defined in the argument. If it means '
a new form of something that already exists', as it is used later in the argument, I'm happy to accept it.
So, do you think things can come into existence uncaused?
That's a difficult question. The short answer is that I don't know, it looks like it might be the case (in terms of new
forms), but I'm uncomfortable with the idea.
The long answer: If you mean can something come into existence from nothing,
the complete absence of anything, uncaused, I'm of the opinion that the question is incoherent; it seems to me that nothing cannot become something any more than something can become nothing (and I don't mean the nothing of 'empty' spacetime, the quantum vacuum, so much used in cosmology - and I'm not talking about empty, as in an empty box. A box with
literally nothing in it wouldn't be a box, it would be flat, with literally nothing separating its opposite sides; i.e. they'd be touching).
If you're asking whether something can change form uncaused, it would be comforting to think not. Intuitively, causality seems obvious, but as Hume showed, in practice, the concept of causation has experiential contingency, and that arguing constant conjunction in terms of necessary connection is ultimately circular. But even if we loosen the screws of logic and accept constant conjunction as sufficient - for all practical purposes - to establish necessary connection, and that we can depend on physical law when it comes to the behaviour of the contents of the universe despite the problem of induction, the fallacy of composition still applies in trying to extend this to the universe itself.
Not only is there no good reason to suppose the universe must behave according to the laws that describe the behaviour of its contents, but whether we do suppose that or not, we still have no experiential grounds for making any assumptions about the causality or otherwise of the universe. All we know is that it exists; we have no experience of the origin of other universes to inform us (nor any experience of the origin even of our own universe).
The other problem is quantum mechanics, which, as it stands, tells us that certain events are truly stochastic - random, non-deterministic, with only a certain
probability of occurring; and it's not just that we don't know enough about the particular quantum system, it's not determined by local hidden information. So, it seems, some events
are uncaused... this is still debatable, so although it looks that way, we can't be sure.
While it may seem that quantum mechanics is only relevant at sub-microscopic scales, that isn't the case when you deal with extremely hot, dense states such as in black holes, or big bangs. In those situations quantum mechanics and gravity share the stage.