I suspect illegal vigilante negro’s.
LOL!
I suspect white punks.
Given the comment is not outright hateful or vengeful, merely cynical, not to mention professionally done, that mostly rules out the feral ghetto 'yoots' and most members of the RoP©. Suggests to me, college kids with time on their hands before school starts. We all know that our education system preaches anti-Christian propaganda.
Not sure if I can include a picture from the article, but here is a link to the billboard picture.