It's the Roman Catholic Church, not the Republican Catholic Church or the People's Revolutionary Socialist Democratic Catholic Church. Its rigid hierarchy and centralising instincts are almost entirely due to the fact that it became the state religion of the Roman Empire more than 1600 years ago. And the Pope is still, in essence, the emperor.
How Roman are the traditions and instincts of the church that Pope Benedict XVI has led for the past seven years? Well, one of his titles is "pontifex maximus", usually translated from the Latin as Supreme Pontiff.
That was the title of the high priest of the old Roman (pagan) state religion under the republic. When Rome became an empire, the emperors took it over, starting with Augustus. And somewhere in the 5th or 6th century - the timing is not clear - the title was transferred to the Christian bishop of Rome, who had become the head of the new state religion, Christianity.
This is not to say that the popes are secretly pagans: they are monotheists to the core. (The answer to the rhetorical question "Is the Pope a Catholic?" is "Yes".) But they are ROMAN Catholics, and the religion they lead is still run like an empire. Very occasionally some maverick pope tries to change the model, but the system always wins in the end.
Benedict XVI was the emperor of a shrinking domain, for the Catholic Church has been shedding adherents not only in the West, where it is everywhere in steep decline, but also in Latin America, Africa and Asia where it once held unchallenged sway. While secularism is the enemy that steals the faithful in the West, evangelical forms of Christianity are seducing Catholic believers away in what we used to call the Third World.