So when you say :
"Assuming that the universe came from nothing as an absolute fact, for the sake of discussion."
there is no problem with that, because that means that your definition of "nothing" is :
- I pick a time t=o as the begining of time
- whatever is in the universe before t=0 I define as "nothing"
Actually there would be no beginning for time, as time would be the nothing that the universe would be composed of, as such, "nothing" in the complete sense" is undefinable in reality. I.E It's full definition is "non-existence", and we happen to be here as a testament to existence, therefore the universe would be an incomplete ongoing definition of nothing, by which existence is secure forever. In other words - We can continue to exist as long as "nothing" remains undefined "in reality". This is like saying that I exist, because I don't exist, but the implicatoin must be carried, if the universe came from nothing as an absolute fact.