Burn them at the stake perhaps? No, that would not be very friendly to the environment what with all the smoke it would produce.
Howsabout disemboweling? Oh, I know, The Iron Maiden. That's always good for getting a heretic to see the light.
No, wait, I got it. Crucifixion. Yeah, that's the ticket.
Burning at the stake and torture for those who disagree with Rome, has historically been Rome’s stock and trade, which this Marxist Pope is chief representative of. Now he tells us Islamic terrorists shouldn’t be insulted. Go figure.