@Soren59
Death would be way, way too easy. At least an imeddiate death would be. They should be: stripped of all noble titles they possess; paraded around the royal city, with the crowd chanting nothing but vitriolic hatred; and then, and only then, they should die by hanging.
Or they could be spared death but forced to stay in jail for life/banished to a land suffering from famine.
I get slightly annoyed when the saints or priests in manga are egotistical, arrogant, and fanatical, and the worshipers are portrayed as cultists. It gives us religious people a bad name.