Actually, this particular (ridiculous) situation might not fall under Jesus' previously established boundaries of his particular brand of pacifism.
After all, in all Jesus' dealings of refusing to fight or refusing to lead a revolution were in the matters of man against man. Mortals exercising their free will against one another.
In this situation, Jesus is now faced with a bunch of false gods who want to fly in the face of free will and subjugate man, to take away man's right to choose. Remember, for Jehovah and Jesus, while a human can turn away from God's way and there will still be a price to pay later, that's later, and it's still the human's choice. If you did something these gods didn't like, them killing you on the spot is probably one of the more merciful fates awaiting you.
Jesus is not faced with mortals made by and granted grace by the Father, he's faced with callous immortals trying to take away that grace. Him kicking a little heathen deity ass is not necessarily sacrilegious.
As for offending pagans... Iiiiii don't know, I'm guessing that Rob figured he was pretty safe from offending anyone who worships this particular pantheon, since chances are they're either a few thousand years dead or 99.9% composed of rebellious posers who considered themselves much too individual to follow the fad of worshiping Egyptian gods and invented a deep spiritual connection with Artemis instead.