War. Nature or Nurture

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I certainly can deny our warlike nature.  All evidence is that before Abram came along and invented God, humans were agricultural - herding communities or hunter - gatherers where the ecology permitted it.  Their gods (if any) were generally earth/fertility oriented and community sustainability was an important moral imperative. 

War was rare although not non-existent, as there were tribal leaders that for one reason or another usually outgrowing their resource base could try to take what they wanted by warfare.  Usually settled communities could defend themselves and the marauders failed usually when the dysfunctional leader was killed. 

Abram's genius was inventing a leader that couldn't be killed because it didn't really exist, and who divided all the world simply into us and them.  Them just didn't count.  This was a successful concept, as poor young men could be convinced that it was "their" fault they were poor and horny and run off to battle for plunder, and women. 

As for the people who created the mythology, whether or not they were inspired by God is moot, as they believed in God, and codified the mythology based on that assumption.  My belief or lack thereof in God has nothing to do with what others believe.  I also do not think that 50+% of the population that believe in Christianity and Islam and at least pretend to read and abide by Scripture is "only a fraction."