User blog comment:Michael.Dreams/The Created and what they could be for Halo./@comment-25316824-20170429031712

This is a good idea and has good historical backing. The 13 colonies united against the British Empire. The German cities-states united against France. The Chinese united to defeat the Mongols. To my knowledge the only region of the world where this hasn't worked is in the Balkans but that is because it is at the intersection between western Europe (Catholics), eastern Europe (Orthodox), and the Islamic world.

In Halo's canon, human religion takes a backseat (for political reasons) so I definitely agree with your analysis.