I hope you see the problem with this.
Materialists must posit the existence of quadrillions of randomly appearing Universes in order to allow for the 1 in a quadrillion Universe that can give rise to life.
Deists must only posit the existence of a designer who created time and space.
Neither is a disprovable hypothesis. Similarly no-one can show that there is no God. No-one can show that there aren't quadrillions of random, mutually orthogonal Universes.
The Deist version can at least be proven - if for instance God were to enter His creation. But the materialist version cannot be proven because of the definition of what a Universe is. If you can detect a Universe, you are in it.. So if you detect a remote piece of dark matter in a Brane dimension coiled within an affine space or whatever, it's part of your Universe. The test of an event belonging to another Universe is that you can't detect it.
Any theory of multiple Universes is therefore completely divorced from the Scientific process. It can't be disproved : moreover it can't be proved. A theory that God made the Heavens and the Earth can at least be proved: God only has to make Himself known.
At this time, you are correct, but many cosmologists speculate that it may be possible, some day, to create universes in a laboratory. If this is proven to be a possibility, then it is easy to speculate that given enough time, trillions of universes could have been created in a similar fashion by multitudes of civilizations reaching that state of technology.
It is speculated that such universes would contain their own sets of laws, and that the creators would not be able to interact with their creations in any way.
Who knows. I love cosmology!
John 14
8Philip saith unto him, Lord, show us the Father, and it sufficeth us.
9Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayest thou then, Show us the Father?
Hebrews 1
1God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets,
2Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by whom also he made the worlds;
3Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the Majesty on high:
Nope. Could be an inter-multiversal creature who has no creative power of his own.
Can't prove or disprove either. All we can do is describe what's within our system...and there's no way that any "special" environment of our existence can support one claim or another.