I'd disagree, unless you want to say pop punk isn't punk (and if that's what you're saying, that's fair).
Stuff like this springs out of acts of popular piety. When you teach that the relics of people in heaven can work as prayer aides, it's a foregone conclusion that some may want to decorate (or even wallpaper, like the photos of the skulls) a prayer space with the highest class of relics.
This is how altars came to have a relic in a stone that the priest kisses at the beginning of every Mass.
It's an unanticipated but popular reaction to authority and came from the bottom up rather than top down, ergo pop punk.
Just because something is old enough to become mainstream doesn't mean it's not punk. Green Day. Blink 182, et al. started out being labeled as punk before the term pop punk became widespread.
I edited for clarity to explain that I'm referring to the subgenre pop punk, which one could easily argue is not punk.