First, the only evidence that Yahwey is somehow a "late bloomer" is if you assume the worship of Yahwey only started with recorded history. We know that Yahwey was part of oral traditions long before being written down. Further we know from other oral traditions, used in other cultures were exceptionally accurate even over thousands of years.
Second, we know from torah that many other cultures were worshiping other 'gods' for thousands of years that there was faith in Yahwey, even within the Israelite culture.
This would be the book with the Talking Snakes and the Giants in it?
The thing is, we know from WRITTEN accounts that other cultures worshiped Ra in Egypt and Ishtar in Sumeria... but Yahweh doesn't show up until about 900 BCE in written accounts.
While Judaism was only enforced throughout all the Jews about 500 BCE, it's roots in the Torah existed back to Moses, which was 1400 BCE.
Actually, here's the problem with that. We really don't know WHEN Moses supposedly existed. The popular version is that he was contemporary with Ramesses II. 1279-1213 BCE. But we really don't know which Pharaoh is the Pharaoh of the Exodus. Candidates range from 1690 BCE to 1186.
Now we know Ramesses was a real person. WE EVEN STILL HAVE HIS BODY!!! But Moses, not so much.
If there is no historical connection of all people's around the world, then we would expect that many, if not most, would have utterly unconnected origin stories.
But in reality we see most, in fact nearly all, have very similar aspects to the Biblical narrative. Which is exactly what we would expect, since all people start at the Tower of Babel, and were scattered to the ends of the Earth.
Or that the Bible is just cribbing stories off of other religions/mythologies. The thing is, the Saga of Gilgamesh predates the story of Noah by thousands of years... and there are even earlier versions than Gilgamesh. So usually, in writing, when something comes first, we assume that was the original idea.
For instance, Flash Gordon preceded Star Wars by about 50 years. But no one is going to claim that Star Wars is the original version about space heroes fighting an evil empire.
In fact, if anything, you see the opposite effect. The God of the Torah is pretty much your Bronze Age Tribal Diety. But when the Jews got sucked into the Persian Empire, you see a lot of Zoroasterian influences. When they were part of the Greek world, you saw a lot of Greek Philosophy getting inserted in, which is where Christianity came from.
Heck, even today's "Christianity" where you all sit around at the Interfaith Pancake Breakfast is quite different than 500 years ago, when you were all murdering each other over transubstantiation and how many sacraments there are.