No; I'm making no assumptions. I'm saying that if you accept the cosmological physics that tells us that the universe is expanding from a hot dense state beyond which we can only speculate, then there are many speculative priors
based on that physics, some of which involve a multiverse. The explanation you said you prefer (a infinite timeless force that is separate from the universe) is consistent with a non-technical description of a multiverse.
Suggesting you could call it God was slightly tongue-in-cheek, but having said that, it does seem less reasonable to accept the physics of cosmology as valid until you reach a point where feel you can insert your preferred non-physical speculation, particularly when you express it in terms consistent with one based on the very physics you want to reject. But hey, who expects religious ideas of God to be coherent or consistent?
Tomarto - tomayto, I have no objection to the multiverse being called God, as a kind of meta-Spinozism; although anthropomorphising the concept is unjustified; the model is no more purposeful or intentional in generating universes than carbonated water is in generating bubbles.
But I get the sense that whatever the model, you'll crowbar your prearranged conclusion into it, which makes me wonder why you bother with any of the cosmology - whatever the evidence, God is the conclusion - am I right?
Your logic leaves me breathless

- and I'm sure you'll find some reason why texts that predate the bible and also 'explain' the infinite and timeless, don't take precedence for believability.