If the Exodus didn't happen, the Jews wouldn't put themselves under the Mosaic law

[xpastor]

From an exchange...

Did tens of thousands of Israelites conspire to fabricate the history of the Exodus? If those events did not occur, and those recorded miracles were not experienced by tens of thousands of Israelites, why would they subject themselves to such a burdensome legal code and hard life?

The person in question doesn't seems interested in there being or not archeological evidence for the event. ....

The answer is really simple enough, but it requires some knowledge of history, which could be gleaned from The Bible Unearthed, already mentioned by Minimalist.

Most of the OT was written between 700 and 500 BC, including the parts which purport to tell of the Exodus supposedly around 1400 BC. In the era when the OT was written the Jews were getting the shit kicked out of them by the Assyrians and the Babylonians. Jewish nationalists made up a religion which was totally monotheistic in contrast to the actual beliefs of the people who thought Yahweh had a wife. Furthermore, their newly minted religion was extremely difficult in order to prevent assimilation. For instance, circumcision and the weird dietary laws set them apart from other nations. It was in this era in the reign of Josiah that someone conveniently found a long-lost book of the law in the temple, namely Deuteronomy, a classic case of literary forgery.