Great question, before the systematic ‘unholy’ destruction of written word came in, one could very easily reference and see how a story is borrowing elements from other stories to be. The bible is one big patchwork of borrowed works. Without accreditation or reference to its sources. In a sense, if the authors thought all is a manifestation of god, then in their thinking god did ‘manifest’ it through the writing of others.
I think there is a lot of academic works with a huge breadth of work devoted just to that topic. One favorite is the series called ‘the criminal history of christianity’ by karlheinz Deschner. The original is in German but it’s slowly being translated.
http://www.deschner.info/index.htm?/en/work/kg/criminalhistory.htm
Very meticulous, what’s astonishing is that there are 7 lengthy volumes – and he’s not done yet.