Welcome to the forum! I very much appreciate that we can have these intelligent discussions through gracious dialogue.
I think we can accept the premise that a lack of evidence cannot be used to prove any conclusion. The existence of David is a great example, previously there had been no evidence for his existence and he was thought of a kind of King Arthur of Israel, but recently tablets were excavated referencing him.
I have a reference from Brittanica that discusses archeological support for Abraham’s story.
I feel that Jesus reference of the Old Testament demonstrates the value of the old testament. I would even go as far as saying the Old Testament may even be more reliable than the new as the conservation of the document was more consistent over a much longer period of time. The narrative of Jesus and the women taken in adultery and the resurrection in the Gospel of Mark are not in the earlier manuscripts and some feel they were added later.
In one version of the story of the woman taken in adultery, when Jesus says let he who is without sin cast the first stone, a rock goes flying by His head, hits the women and Jesus says “Mom, sometimes you can really embarrass me!” (I heard this joke from Bart Erhman, but I think it has an older Catholic source)