If one stone in the Vatican is ever even chipped by these goatshagging jihadi POS there is gonna be the biggest can of whoopa$$ ever opened and it will be coming for a visit.
Let's just say that we can begin with Mecca delenda est.
One stone? They are very desirous of nuking it - one of the uses Iran intends when they have a working nuke stock pile, missile ready warheads, and reliable delivery systems. ISIS would be most pleased to be the party launching the missile.
For now, ISIS might just settle for a bunch of self-exploders while some public event is being held in or around the Vatican. They got some fancy new, undetectable, body-implanted explosives to try out, you know.