Though, from the evidence that we have seen (which is at least several videos and many photos), Don does not appear to be committing a crime. Other than perhaps trespassing, which he has not been charged with. AFAIK
He is not protesting, he is not yelling or intimidating. Everyone was free to walk around or sit/stand and watch. Once the service had abruptly ended, he approached various people for their comments. And a couple of parishioners (two young guys) approached Don with their comments.
imo