That the Hebrew Bible is not a fully-fledged, reliable historical source should actually be an open door. Certainly for the earliest period of ancient Israel, say from 1200 to 600 BCE, the historical value of the Bible stories is very limited. And that is also logical: the oldest texts from the Hebrew Bible were only put into writing after 600 BCE, centuries after the facts, and then continuously edited, in some cases even dozens of times, until they more or less reached their definitive form in the 3rd century BCE (and even later). Moreover, and above all: the texts primarily served a religious goal; not the historical but the religious message was paramount, and that message also evolved over time, which meant that the text also had to be continuously adapted, not least in function of the radical Yhwh-ism that placed the temple in Jerusalem at its center.
That’s why it is logical that we look at the Bible texts with some skepticism if we intend to discover what the real history of the Jewish people is. The German theologian Bernd U. Schipper makes this abundantly clear here. Schipper is particularly strict: the patriarchal stories, the stay in Egypt and the exodus, the military conquest of Canaan, the glorious united kingdom under Saul, David and Solomon, …: according to him, these are almost certainly largely made-up stories. As said, there certainly are strong arguments for this, although in my opinion Schipper passes over the question of whether and which (limited) historical cores could be hidden in all these stories a little too quickly. And if he does, he sometimes dares to propose a very far-fetched alternative explanation, such as that the exodus actually referred to the departure of a very limited group of inhabitants of Canaan after corvée labour in the service of a city in the southern Levant that, at the time, was an Egyptian stronghold. And subsequently, he presents that hypothesis as a fact in his summary. Rather questionable, isn't it?
To put it a bit sharply, Schipper’s attitude boils down to the fact that he rejects almost all Biblical stories as historical sources, whilst non-Biblical texts (Assyrian, Phoenician, Egyptian, etc.) are almost automatically considered reliable, and the archaeological finds by definition indisputable. Methodologically, this, at the very least, can be called unbalanced. Incidentally, you can notice that he does not fully maintain his strict position for the more recent Biblical books (from the Persian and Hellenic period), since he regularly refers to them to confirm historical facts. To be clear: here too, in general, he remains critical and regularly points out errors or misrepresentations.
I am certainly not going to claim that this book is no good. It offers a comprehensive overview of the earliest history of the Jewish people and it also raises many pertinent issues. But in his zeal to be the best in the (skeptic) class, Schipper has in my opinion gone a bit too far, and is not always consistent. Well, I'm just beginning my reading program on ancient Israel, so I may change my mind later.
Disclaimer: This review is only about the Bible as a historical source, not about the theological value of the texts; these are two very different things.