https://en.wikipedia.org/wiki/AbrahamMost historians view the patriarchal age, along with the Exodus and the period of the biblical judges, as a late literary construct that does not relate to any particular historical era; and after a century of exhaustive archaeological investigation, no evidence has been found for a historical Abraham.
... citing McNutt, Paula M. (1999). Reconstructing the Society of Ancient Israel. Westminster John Knox Press. , and
Dever, William G. (2001). What Did the Biblical Writers Know, and when Did They Know It?: What Archaeology Can Tell Us about the Reality of Ancient Israel. Wm. B. Eerdmans Publishing.
One of the reasons this argument makes sense is the Torah was composed in the 6th century BCE while there were tensions between Jewish landowners who had remained during the Babylonian captivity and the returning exiles. The ones who stayed behind used 'father Abraham' to bolster their claims; the others appealed to the tradition of Moses and the Exodus. This rings true, that justifying land rights would inspire literature.