When the head of the Catholic Church is cool with it and people like Piers Morgan are not, this looks more like a dig at non-Christians and how much fuss/protection you imagine you'd see if this gala were about e.g. Judaism or Islam.
Do people who get offended by this also get bothered by not-very religious people wearing crosses or crucifixes?
If your motives truly are about not having the Catholic Church demeaned or disrespected there are much more appropriate targets, like child abuse scandals.
FWIW I don't know one practising catholic who is bothered by this gala.