Origin of Rebellion

Does it make sense to search for the origin of morality when we presuppose the code of morality to which it has presumably led? What if we were to discover an origin inconsistent with the presupposed code? If the code were beyond question, as moral codes tend to be, we would have to reject our findings, no matter how persuasive they were. Therefore, the search for the origin of morality could be nothing more than a quest for communal justification, or perhaps just personal intellectual recognition, unless we were engaged in an act of moral rebellion.