But there is a logical disconnect even outside the Darwinian fantasy approach, which is this:
Materialist claim:
All things which exist are material (note 1);This is a direct example of Russell's "Set of All Sets Paradox". When Russell and Whitehead were writing Principia Mathematica, which they intended to explain all mathematical concepts, Russell encountered the paradox whereby a "set of all sets" must also include itself, and therefore could not be a true set of all sets. Paradoxically, there can be no set of all sets.
The source of all things which exist is therefore material.
The materialist claim, above, is paradoxical for the same reason. If the source of all things which exist material, then it must be the source of itself (self-referencing), or have existed forever in infinite time (infinite regression), or else require a non-material source (the claim is false).
The multiverse is an extension of the known universe (actually only partially known), and is an attempt to assert the infinite regression without having to face the usual philosophical disdain for such a claim.
Some try to assert the "material source created itself" position, but unsuccessfully. Hawking required preexisting physical laws which affected a quantum field. Krauss claimed that "coming from nothing" meant coming from the preexisting quantum field or foam or whatever preexisted, which was not material but only pre-material (or something like that). In every case, there is never an actual absence of all concepts of preexistence involved in creation-from-nothing. So it devolves to another infinite regression.
But under Godel's theorems, a hierarchy must exist if knowledge is to be certain. This brings us back to Darwinian Just So Stories, which are created imaginings of connections, fables without evidence, and then considered to actually BE evidence. That is exactly what the multiverse is.
Note 1: This claim cannot be proven materially or rationally; it is an assertion only. The use of this assertion as a premise renders the entire argument to be false. Further, it is part of a Category Error, in which material methodology (required) is used in attempts to claim that there is no material evidence for non-material existence.