"A Rabbi and a Priest" joke

A Rabbi and a Priest were sitting together on a train, and the Rabbi
leans over and asks, "So how high can you advance in your organization?"
The Priest says "If I am lucky, I guess I could become a Bishop."
"Well, could you get any higher than that?" asks the Rabbi.
"I suppose that if my works are seen in a very good light that I
might be made an Arch Bishop" said the Priest a bit cautiously.
"Is there any way that you might go higher than that?"
"If all the Saints should smile, I guess I could be made a Cardinal",
said the priest.
"Could you be anything higher than a Cardinal?" probed the Rabbi.
Hesitating a little bit, the Priest said "I supose that I could
be elected Pope, but..."
So the Rabbi says "And could you be anything higher than that?, is
there any way to go up from being the Pope?"
"What!!! I should be the Messiah himself!?!"
The Rabbi leaned back and said "One of our boys made it."