It is where; it dosen't come from where.
Where is the universe located? Into what is it expanding? Where was the singularity located before it Big Banged? Can a finite number of subatomic particles ultimately disperse themselves equally through an infinite space, or is space not infinite, therefore contained by something?
These questions hurt my head and do not, in any way, imply that God does not exist.
"Disproving" some literal concept in the Judeo/Christian Scriptures is *often* confused by atheists as somehow proving that there is therefore no God.
Also, positing that there are a *lot* of universes instead of one also does not imply that God did not create the aggregate "multiverse."
If logic is important to you then you must recognize that this approach to proving the non-existence of God is completely fallacious.
Inside the multiverse
Into what is it [the universe] expanding?
The multiverse