What do you get when you combine a biblical story with King Arthur?

Though the first passage was familiar to the previous one we read, it did strike me at the end Arthur's plan to kill his own son was...well...way to friggin' familiar. Though I guess that does help with the propaganda. My question is: Does replacing the tell tale story of Moses from the bible (and various Greek tragedies that the plot bases killing their own son so they won't usurp him) add positively to the propaganda of King Arthur's story of success?