The international gathering is part of the Catholic Church's drive to inspire a "new evangelisation" forged by the pope's predecessor Benedict XVI and it is timed to coincide with Pentecost, the feast of the Holy Spirit.
"A lot of young people from these ecclesiastical realities have not only recovered a faith lost or turned sterile but have accomplished a true conversion," Renato Fisichella, the Vatican's point man for evangelisation, said today.
Paul Bhatti, a Catholic like his brother, is minister of national harmony and minority affairs and head of the All Pakistan Minorities Alliance.