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As clerical sex abuse scandals buffet the Catholic Church, a three-week assembly of bishops is under way in Rome on how to make the Church relevant for young people. But the assembly, known as a synod, will likely be dominated by what many analysts call Catholicism's worst crisis since the reformation.

Roughly 250 priests, bishops, cardinals and some younger laypersons are participating in the synod.

In the opening mass, pope Francis urged them "to dream and to hope."