Just can’t stop

can you?
Where do materialist suggest that something came from nothing?
It is implied by materialism because the alternative to something coming from nothing is that existence/being is neccesary - and the existence of a neccesary being would appear to contradict materialism.
If you’re thinking of the Big Bang theory, then you’re only demonstrating your misunderstanding of the theory, albeit an all too common one.
No, I deliberately didn't mention "the beginning of the universe".
It looks like you’re struggling with the concept of time not existing, each of your reasons above depend on chronological events.
No, I haven't failed to account for time, either scientifically or philosophically. There are two different versions of the cosmological argument. One of them, usually called the "Kalam" cosmological argument, is the argument that there had to be a first temporal cause. The other is the argument from contingency. This does not mention temporal causes - instead it is concerend with
logical causes otherwise known as "sustaining causes". It is a claim that all of the things in the Universe a contingent and claims that the existence of these contingent things must be traced back to either an infinite series of contingently existing things (which would be an infinite regress) or to a thing which exists neccesarily.
In order for one thing to “come from” another requires the latter to exist before to the former, and in order for there to be a before requires time. If you’re looking to refute the concepts of the Big Bang theory, you’ll at least need to have a full understanding of it. According to the theory, time did not exist before the Big Bang, thus you’re “come from” analogy is invalid.
The argument has nothing to do with big bang theory or the cosmological argument from first cause. I asked "Why is there something instead of nothing?" I didn't ask "What caused the Big Bang?"
I think you must first prove there was absolute nothingness.
No, I don't need to do this. If there was not absolute nothingness then either a neccesary being exists or you have to posit an infinite regress of contingent things. Since I believe in a Neccesary Being, there doesn't seem much point in me trying to prove there was ever a state of absolute nothingness. Its not a problem
for me. But it
is a problem for materialists. As far as I am concerned
there cannot ever have been a state of absolute nothingness, precisely because if there
had been, then there would still be nothing. But this implies that existence is neccesary.
Again, if you’re thinking of before the Big Bang, then your reasoning is flawed. You’ll have to create an argument without the use of time.
I never mentioned time. I think our understanding of time is very limited indeed. My own beliefs about the nature of time are a little unusual anyway - I believe there are situations in which the past can change, from our perspective. Stated another way - only the present exists.