I ultimately agree with you, but I can't prove it; certainly not in any "absolute fact" sense. So, in fairness, and in the interests of being academically honest, we have to admit that. I also agree that something can't come from nothing, but many atheists also recognize this and accept that there must be an initial uncaused, cause. However, instead of God, they posit an uncaused, eternally existent multiverse. I don't personally believe that, but what "absolute proof" can you give against such a view? Can you prove as an "absolute fact" that such a multiverse does not exist?
But if time is an attribute of our three-dimensional Universe, it began at the point of the Big Bang. Prior to that point there was no 'before' and referring to 'eternally existent' is largely meaningless.
Even 'cause and effect' may no longer have the meaning we normally attach to it. It's the point at which we disappear down the rabbit hole of theory.
No, that's just a semantic game that simply means there was no 'before' in our universe. It doesn't apply external to our universe. Ironically, it also reaffirms the point that our universe has not always existed (as your statement simply means the spacetime fabric of the universe that is our universe has not always existed), and therefore is contingent, and therefore requires a cause external to itself.
Not to nitpick, but there is no such thing as "outside our universe". By definition the universe is all encompassing.
If that is true, then there can be no transcendent God "outside the universe."
May I ask how many phD's you possess? How many do you possess? I've watched interviews with professionals in the field, theoretical physicists and cosmologists on this very question and not one has ever suggested that an entirely natural explanation for our Universe is unattainable. Then you should be able to give one plausible theory as to why there is something rather than nothing.
I don't have any but I do spend time listening very carefully to people who have many and dedicate their lives to understanding the various mechanisms by which the Universe functions.
On the hackneyed question of "why there is something rather than nothing", it's a meaningless question to ask because 'nothing' is never (/cannot be) defined.
I have to stop you right there: "Why there is something rather than nothing" is recognized as the penultimate question in philosophy, so hardly 'hackneyed.' 'Nothing' is the absence of anything, and the 'something' is usually referent to our universe: "Why does our universe exist?" is far from being a meaningless question to ask, and brings us full circle to the contingent finitude of our universe, the need for an external cause, and the ultimate 'brute fact' assertions that both atheists and theists have to make to solve it.