What a joke. You read your share of literature on the theories of composition of the Bible that you found on the internet.

Many of the towns (villages, really) and rulers (he fights against 5 kings to save his nephew, Lot) that are mentioned in conjunction with Abrahams story are easy enough to trace back via archeology. Attempts have been made to disprove his existence but the places referenced could not have been known in the later times (before the archaeology) when you “claim” the Torah was written.