The tale of Moses is not exactly fresh cinematic material, so anyone attempting an update would to be wise to have a theme. The subtitle of Exodus: Gods and Kings suggests that Ridley Scott intended just that. The director must have meant to contrast the decadent Egyptian pharaohs, who imagined themselves divine, with the humbler servant of the Hebrew G-d.
That idea is submerged somewhere in Scott's bombastic epic. But it's about as easy to read as the message plucked from a chicken's entrails for the edification of Seti (John Turturro), Egypt's Pharaoh when the story begins.