If there had been a massive migration of hundreds of thousands of people, and even more so hundreds of thousands of slaves, from late bronze age Egypt (a powerful, old, highly literate kingdom), we would expect to find significant evidence of this (inscriptions, local stories, migration sites, etc). The absence of any such evidence, while not conclusive proof of course, constitutes evidence against this event happening.
We also know for example that the types of beliefs detailed in Exodus, especially the idea that the Israelites worshiped Yahweh alone as the only God, are not historical. Belief and worship of other gods were common in both the ancient kingdoms of Israel and Judah long after the supposed time that the Exodus happened - in particular El (who was later associated with Yahweh) and Asherah (who was sometimes seen as the wife of Yahweh). So at least this aspect of the Exodus narrative is directly contradicted by archaeological evidence.
This is similar to the reason we believe the stories in Genesis are not historical, e.g. the flood, - if they had been historical, we expect that they would have left behind certain marks; those marks haven't been found, so we have a reason to believe that they didn't happen.
The absence of any such evidence, while not conclusive proof of course, constitutes evidence against this event happening.
There is documentation in Egypt of slaves around this time, and of the subsequent departure of some unstated number of slaves. There is evidence of pig bones disappearing from trash sites on the path of the migration, and there is evidence of a shift in religious practices along the migration path. So there is some evidence of an event similar to the Exodus occurring.
We're talking about something that occurred over 3000 years ago. Most events back then weren't recorded, and even then it was still so difficult and time consuming that Egypt and Ancient Greece generally left out the embarrassing parts, most of which we only know about because their contemporaries wrote about it to disgrace them (and most historians now suspect that the vast majority of negative accounts of other civilizations were wholly made up, especially those written by the Ancient Greeks).
Very few nomadic migrations left evidence on the way. There is more evidence of the some sort of exodus having occurred than of the human migration from Asia into South America (note: an increasing number of historians claim the first migration was by sea from Africa, not over land from Asia).
Flood legends are very common among ancient Eurasian cultures.
As the last Ice Age melted away (20k–8k years ago), there were very likely several major floods in the region.
>We also know for example that the types of beliefs detailed in Exodus, especially the idea that the Israelites worshiped Yahweh alone as the only God, are not historical. Belief and worship of other gods were common in both the ancient kingdoms of Israel and Judah long after the supposed time that the Exodus happened - in particular El (who was later associated with Yahweh) and Asherah (who was sometimes seen as the wife of Yahweh). So at least this aspect of the Exodus narrative is directly contradicted by archaeological evidence.
I feel like you haven't read Exodus because it describes in detail the early Israelites' predilection for idolatry.
> We also know for example that the types of beliefs detailed in Exodus, especially the idea that the Israelites worshiped Yahweh alone as the only God, are not historical. Belief and worship of other gods were common in both the ancient kingdoms of Israel and Judah long after the supposed time that the Exodus happened
I'm not sure what the point you're trying to make is. IIRC, that stuff is in the actual Bible. Like, a significant chunk of the Old Testament is about "Israelites [not] worship[ing] Yahweh alone as the only God."