yeah but if it's gods plan for the pope to get shot he shouldn't defy gods will, that's a sin

there're a lot of different ways of looking at God. The Pope is the leader of Catholicism, via which they believe in free will. According to them (well, us, but I left that path long ago) God doesn't make people do what they do, man does, hence my prior comment

If God wanted him to be shot, the bulletproof glass wont save him.

Yes it will, because God doesn't exist and it's bulletproof glass.