huh? No I'm not Catholic. I'm not an atheist/conifer hedge/cheeto/dog scab either but I'm curious about them.
The pope is the vicar of Christ on earth, the successor of Peter as head of the church and the apostles, and the spiritual leader of the Catholics. It's that simple!
He also happens to be a visiting head of state, so they have to pull out all the pomp and circumstance for him like they would for the Queen of England or the French president!