The Legionaries of Christ, an influential Roman Catholic religious order, have been shaken by new revelations that their founder, who died a year ago, had an affair with a woman and fathered a daughter just as he and his thriving conservative order were winning the acclaim of Pope John Paul II. Before his death, the founder, the Rev. Marcial Maciel Degollado, had been forced to leave public ministry by Pope Benedict XVI because of accusations from more than a dozen men who said he had sexually abused them when they were students. But most members of the Legion continued to defend Father Maciel, asserting that the accusations had not been proved. Father Maciel died in January 2008 at the age of 87, and was buried in Mexico, where he was born.