Where did the universe come from? Atheistic origin science has no answer.

[pocaracas]

No one says the universe came from nothing.

Then what do you say? Where did the universe come from?

All we know... actually infer from the available evidence... is that the known Universe (we have no idea about the unknown in this universe alone, much less about any other possible, but also unknown, universe) once was extremely dense and extremely small.
Prior to that, if "prior" is a concept that can be applied to that state of the Universe, we don't know.
No one knows.

Anyone who claims to know is practicing the art of lying.

Hypotheses abound, of course... each crazier and more far-fetched than the next... but none is verified, none is validated, none is true. (I know how you god-believers like the word "true")

Why did I say that the concept of "prior" may not apply? Also, why did everyone else say that the concept of time and causation may not apply?
Because there is a hypothesis that claims the nonexistence of the space-time fabric, absent of a universe.
If there's no space-time, then there are no distances, no duration... all, or most, our verbs become meaningless, such are the ties of our language with actions and their reliance on time and causation and distances.
Our way of conveying concepts becomes inadequate to handle these notions. Our way of reasoning itself feels paradoxical... we can't understand the absence of space and time. At least I can't... and I'm a physicist.
What does "absence of space" mean, anyway?! I don't know... I can't imagine it... I can think of the concept, but not of the actual implementation of that "thing".

It is in this mental paradox of poorly defined concepts and under-equipped language that theist apologists work to easily insert the notion of a being capable of generating the Universe from the absence of everything, including space-time.
It can be considered a hypothesis.... one that, as all others, lacks verification and validation... and truth.