Science has ruled nothing out. Multiverse that did not have a beginning, cyclic universe etc. are all possible. Many theories exist of that nature.
Most current approaches eliminate the singularity.
All we do know is that the universe had a start. The Big Bang rang a bell that's still ringing, i.e. the CMBR (cosmic microwave background radiation). But we know absolutely nothing about what caused or preceded it. A leading proponent of multiverses, Stephen Hawking, pretty much went over the edge starting around 20 years ago. He's even had to back down (kicking and screaming) from his claim to have shown that there is no God, based on evidence from before the Big Bang which was bogus. I know his situation is sad, but he's turned bitter and it's clouded all his thinking.
https://phys.org/news/2015-02-big-quantum-equation-universe.html
It talks about
not predicting a Big Bang singularity, not that it didn't happen. What quantum interpretation are they applying their new equations to? And how do they account for the (accelerating) expansion of the universe without that expansion having a beginning, and what about the CMBR?
The multiverse hypothesis has more going for it than the other options. It's the more parsimonious answer to the fine tuning problem, the other being a god.
The Transactional Interpretation of QM answers all quantum weirdness, including non-local vs. local issues, the double slit experiment and entangled particles.
I don't know why you say that is is "irrelevant in any case vis a vis God." Can you expand?
Just saying that whether there are multiverses or just one
universe, that has no bearing on whether God initiated things or not.
I'm not sure what you're saying, but for me, the default position on anything that cannot be shown to be correct/exist or incorrect/nonexistent is to suspend judgement...
That's exactly what I'm saying. Without evidence, the default position involving two or more possibilities, is I don't know agnosticism which puts the possibilities on the shelf, neither/none of which can be a default position.
...and behave according to the principles of risk management, which basically asks that given I must choose to act or not act despite having incomplete knowledge, and given that either choice could be wrong, which mistake if made is the most absorbable.
Does that sound right to you?
Not that part, no. To begin with, how did risk management get involved? Without evidence, the only difference between the choices on the issue at hand (a laissez-faire God creating the universe or not), is hope, or the lack thereof. How does that involve risk? Believe whichever makes you feel better. If I'm right, you have to hear me say I told you so; and if you're right, neither of us will ever know. Hmmm, I guess that choice could be a form of risk, but with no consequences in this universe, and minimal in the next.