Possible Clues:

• Catholic Church head (Last four letters + ...)
• Spiritual leader who rides in a customized car
• Vatican leader
• Obviously Catholic person, in a snarky rhetorical question
• Wearer of a famous ring
• Vatican VIP
• "Who do you think you are, ___?"
• Noted Iraq war critic who recently visited the White House
• You may hold Dad to be a very important person