Let me guess, Josephus? He attested that there was a cult following a man named Jesus of Nazareth. It is absolutely not widely regarded that the gospels are historical documents unless you mean in the same way that the aeneid and odyssey are. The synoptics and john aren't even in full agreement.

The old testament is less accurate, but has some more interesting scholarship.

I sincerely encourage that you actually read some secular scholarship on these topics. Roman Judea was a backwater on the edge of an empire in absolute disarray (the claimed lifetime of Jesus means he was born a subject of rhe Roman republic and preached and died a subject of Augustus). Furthermore ancient Canaan was a backwater of Egypt and Babylon that plays a very different role in each society's histories. And don't forget to look at the recordings of non Israelite canaanites (and not just Samaritans).