The case seems to be that the Hebrews seperated themselves out from among the Canaanites at some point and called themselves Israelites. If you're going to argue we should take the Hebrew Bible as history, you can forget it, because most of it wasn't written until the time of Ezra, whilst other civilizations you're speaking of have texts much older.
The Bible itself proves that much of it wasn't written when it says it was. Example: Dueteronomy wasn't written by Moses, because it gives the account of his death and says that "until this day" his sheplecure has never been found.
Joshua and Judges are similar in their claims, showing these texts were all written much later.
Just because there is a name at the top ofthe book doesnt mean the whole book was written by that person. The book of kings would have to be written by all the kings if that were true.
Your argument is that because moses death was written in deuteronomy that means none of the book could have been written by moses, just doesnt make sense. For example if you had a diary most of your life, then you died and your children or other relatives found your diary and wrote at the end of the diary that you died on whatever day and you were buried wherever etc. Does that mean that you didnt write most of that diary?
Are you saying someone has to write something down for it to be history? If thats the case, then everytime someone goes to court and says what they witnessed something, it must have never really happened because they didnt write it down. Thats just not a valid argument, oral history is a part of history as well.