About the 'historical Moses'... right. It's downright amazing how much one can confabulate out of how little actual data
Let's look at the proposed elements there:
- that somehow it needed to justify just the Levites as coming from Egypt: actually, everyone came from Egypt in that story. Every single jew. Narrowing it down to just justifying the Levites' claim to power is not just needing to ignore the fact that there is no corroboration for that, but even go against the document being taken as evidence.
- that those brought monotheism out of Egypt: that's plain old superfluous. There was no need for anyone to bring monotheism circa 1200 BCE, as the whole zone had been ruled by, you know, Akhenaten before that. Plus it's right across the border from the monolatry of Marduk in Mesopotamia, which also already existed and was expanding fast in the same time period.
Plus, there is no evidence that the Jews actually were strict monotheists until much later. What they had was proclaiming the primacy or even supremacy of their own God... same as everyone else was doing all over the darned place. We have prayers on tablets proclaiming the supreme power of one Mesopotamian god, and stopping just one step short of flat out denying all others, for literally every single one of those gods, centuries before the supposed date of Moses.
Ditto for the Egyptians. Every god did effectively everything for its followers, and if you look at that negative confession one is supposed to do before Ossiris, one is only required to not have denied the patron god of that city.
Indeed, according to some, following just one god, or one god-and-goddess family, is the natural thing to do for humans, because gods are effectively surrogates for one's parents. And nobody wants to be the son of two dozen fathers
So really, there was nothing for those to bring over.
- Egyptian names: actually there is a rather strange lack of those.
Eleazar is a Jewish name meaning "God has helped" or "God's assistance." It was also a very common Jewish name, anyway, in the period when that fiction was written and ever since.
Aaron is hypothesized to possibly come from an Egyptian name, but it also has at least three possible purely Jewish origins. And again, it was and still is a very common Jewish name regardless of what origin it may have been. (Sorta like if I were to write today about some guy called Matthew, it would be silly to proclaim that he must be a Hebrew just because the name has that origin.)
Phinehas... ah, Phinehas. Now we're getting somewhere more interesting. Phinehas is POSSIBLY a corruption of an Egyptian name, but actually we can't be too sure of that, not the least because we don't know the vowels used in the Egyptian name. And it would still be a corruption either way. But again, even here there are equally possible Hebrew roots, and the traditional explanation of his name is based on one such root.
It also doesn't help that the supposed Egyptian name isn't a name that any Egyptian is ever recorded as having, nor one which any Egyptian would actually give his kid. It's just a combination of two words that may (or may not) have had the right vowels in Egyptian to sound that way when combined. Why? Because "Pa-nehasi" actually means "the southerner", i.e., as Egyptians used that term, "the Nubian". It's not clear at all why would someone give his kid such a name, not the least because we have a supposed name that includes the definite article. "Pa" (well, "p", since we don't know the vowel) was literally "the". Would you NAME your kid something like "the Mexican"? Well, neither did the Egyptians. We don't really know any other name that was built that way..
But the bigger problem with Phinehas is that he's the son of Eleazar, who has a purely Hebrew name. So it's like, you know, he suddenly just becomes Egyptian for no explained reason, if you want to make him Egyptian. It's like saying that if an American guy called Mike has a son and names him Ivan, then that shows that the son is a Russian. It just doesn't work that way.
And so on.
- '
but whoever made that up would want the power and glory for himself'... No, not really. Hyping a mythical or legendary ancestor was just as common, if not more, and you can see even the Jews doing it in Abraham and a few others. And especially for establishing a claim on behalf of a whole group, going back to an ancestor was really the only way to do it. And again, it was a popular explanation both for groups' claims to glory (think, the Greeks hyping the supposed ancestor Hercules, or Romans hyping Romulus out of proportion) and even for explaining traits of animal species. E.g., inventing some memorable incident in which an ancestor of the zebras gets his stripes, as an explanation for why the Zebras have stripes.
- '
there is no record of anyone in the area at the time doing that'... actually, there pretty much is no record of anyone in the area around 1200 BCE claiming anything. The Archaeological record is rather opaque at the end of the Bronze Age, and written records even more so, not just there, but pretty much everywhere around the Mediterranean except Egypt and Mesopotamia, because, you know, there was a bit of a population migration and collapse of civilization going on at the time.
But then assuming something just because there's a lack of evidence for the opposite is kinda silly anyway. I mean, nobody else claimed to have slain the dragons in Skyrim for me, but that doesn't make it a real event
What we do know however is that the people that came on top in those migrations, routinely DID invent claims in the name of an ancestor.
E.g., the Dorian Greeks also appear out of nowhere after the collapse at the end of the bronze age, as having displaced the old Mycenaean civilization, and sure enough they invent a mythical ancestor (Hercules) that did wonders of might all over the places they had conquered, and has an impossible history that can't possibly have happened that way.
E.g., the Romans may have come from somewhere else (they don't quite fit in with the Etruscans around) or maybe not, but they invent a convoluted historical claim that doesn't just make them come from Troy, but be specifically descendants of Aeneas. (Or at least Romulus and Remus were, plus the whole gens of the Julii, at the very least.) Not only they claim a historical ancestor that's actually a fiction character in a novel, but it's a physical impossibility because it needs 3 generations to span 5 centuries. So, yeah, there you go, that's an invented glorious ancestor, even if they just hijacked a novel character rather than invent it from scratch.
Rejecting something as common just because there is a general lack of evidence of anything whatsoever in a particular time and place, is exactly an argument from ignorance.