I can’t say I understand what a probability bubble is so can’t comment on that. As the most obvious explanation is the most likely, existence is natural, patterns form out of the exchange of energy, life evolved in some places, competition for that life implemented social structures, sentience ignited that social structure to a more and more complicated degree.
Everything 'came into existence' with the expansion of the universe. There is every reason to accept a naturalistic origin of the universe as opposed to any claimed supernatural origin. It is a pretty simple matter that the supernaturalists fail to comprehend; they need to provide some support for the existence of their supernatural gods before they can assign universe building tasks to them.
There is nothing to indicate that any gods caused the expansion.
The chemistry of the universe makes the building blocks of life abundant. Why would any gods make the universe so vast, put in place the chemical compounds that support life and then abandon it all by making the planet 6,000 years ago and supernaturally creating life on the planet?