The influence of ‘foreign gods’ was already experienced in the time of King Solomon when he became more secular and political. He married foreign wives who brought their religious belief. Solomon it seemed did accommodate them by giving them freedom to practice their belief. In fact, he even allowed it to be part of his court.
Later prophet Elijah challenge to the priests of Baal was a good example of how the religion of Judaism had been so much corrupted.
There were still idolatrous priests and pretty much of the utensils being used in Baal worship were kept in the temple in the vessels.
I have a feeling that the denizens of the website i took that from would probably nod in approval to your statements, as they would take it as a sign of the necessity of the revelation given to their Mohammed in order to fix the transmission of knowledge from Yahweh/Allah/However you wish to name It.
There was no evidence that the Torah was completely lost. It just that eventually it was not the official religion anymore which was a deviation of what the Hebrew kings should be.
It was not impossible for individual Hebrews and faithful priests in the whole nation to keep their own copies of the Torah that when a good king came into power like King Josiah, he could start the reformation of the adulterated religion.
And herein lies the problem, at least for me.
There comes a particular point in time when textual, historical, and archaeological evidence ends and at best we are left with several alternative conjectures.
And depending on one’s faith commitments, the conjecture chosen just so happens to fit in line with a specific communities’ internal narrative.
Because all of you - Jewish, Christian, Muslim, Hindu, hell even New Atheist, whatever - have a specific
a priori belief that colors the way one looks at pieces of evidence and or gaps in the historical record.
For yourself and those of the Jewish faith, i’m sure this isn’t much of the an issue. To the Muslims, who put such a powerful emphasis on the supposed homogeneity of their holy text - this is apparently a piece of evidence that bears out the truth of their faith.
What i personally find fascinating is that these explanations, whether we speak about the Historicity of Jesus of Nazareth (a thing most Christians like to bring up), the textual uniformity of the Quran (which Muslims like to bring up), etc. etc. are usually taken by members within a specific faith community as being strong pieces of evidence for the veracity of their faith…
…except that for those existing outside of that community, those pieces of evidence aren’t taken as such.
So whenever I see any sort of Intra-religious debate, I can’t help but note that people end up foisting up talking points that…well… really on work on an opponent if they happen to share your worldview.
If the don’t, then whatever is “admissible evidence” for one religious tradition is invalidated in another.
It makes it all look like a fool’s errand, because the criteria for what is and is not valid is different for both sides.
That’s the equivalent of say, deciding you want to play a sport with both teams using different sets of rules…