I'm not sure I understand your point fully. Are you saying Filo V shouldn't have used that avatar out of respect for the people who believe in Jesus?
I don't think the comparison with your sister is appropriate. That would be a personal attack.
You lose the argument by Godwin's Law.
But attacking Jesus pretty much feels like a personal attack to A LOT of people... don't you realize that?
Jeez, I am making myself seem like a religious individual with strong beliefs, and I really am not.
I just like respecting people whatever their beliefs are, and I expect people to respect me back just the same way.
The image is offensive for a lot of people, hence he shouldn't use it.
I also agree with you that religion and its entities shouldn't get half the immunity they get most of the time, but that is a whole other story..