Catholics haven’t attacked Charlie Hebdo, so why would they need to prove anything?
The Muslims won’t see it as— gee, look Catholics will even print the cartoons themselves! Aren’t the Catholics righteous, comfortable with their religion and have a good sense of humor.
The ones that this display is meant to target and teach will look at as a show as Catholics think so little of their religion that they would do such a filthy thing. The Islamist think different.