What? Again? If you paint a painting, are you confined by the properties of the painting? (To avoid confusion, the correct answer is “no”)
Even non-believers should know that the properties of this world, including time, matter, and space, did not exist at some point (point - just using our limited language as well as I can), according to scripture and the current predominant scientific theory. Asking where anything outside of creation “came from” is inane, because we are bound by all of creation’s properties cannot imagine what being unbound would be like.