SANTIAGO (Reuters) - Pope Francis on Thursday promised “never again” to Chilean Catholics scarred by a culture of clergy sexual abuse and cover-up in the country where a widespread scandal has devastated the Church’s credibility. In a letter to all Chilean Catholics, Francis also praised victims of sexual abuse in the country for persevering in bringing the truth to light despite attempts by Church officials to discredit them. Reporting By Dave Sherwood and Philip Pullella; editing by Grant McCool