Is this the reason the bible plagarized codes of moral behavior into it's dogma?

When man was a hunter gatherer nomadic type --early in prehistory--the religions were shamanistic in nature (nature worhip--mother earth worship etc). When man urbanized land became valuable-thus in order to survive--religions needed to have a fixed location in order to survive (temple etc). Temples cost money to mantain and build--so--the dogma would have to change to make sure the faithful remained faithful and contributed to the religion. As governments and religions were intertwined it seems quite reasonable that the religion would take the social rules and weave them into their own mythology. Since a number of various codes (mostly sumerian, egyptian, and babylonian--predate the ten commandments and teach the same thing) existed before the bible was written--isn't it clear that the hebrew authors simply plagarized existing moral codes into instructive allegories like the ten commandments.