At the entrance to the choir, a raised liturgical platform has been installed with a bronze altar by Jean and Sébastien Touret at its centre, consecrated in 1989. On the sides of the altar are seen the four great prophets (Isaiah, Jeremiah, Ezekiel and Daniel), and on the front, the four evangelists (Matthew, Mark, Luke and John), the heralds of the Word of the Old and the New Alliance.
Since the Second Vatican Council, mass has been celebrated at the entrance to the choir, the priest facing the congregation, as the pope always was at Saint Peter's in Rome.