It was a major promise after a major disaster: In summer 2011, the Catholic Church in Germany pledged full transparency. One year earlier, an abuse scandal had shaken the country's faithful, as an increasing number of cases surfaced in which priests had sexually abused children and then hidden behind a wall of silence.

The Lower Saxony Criminological Research Institute (KFN) was given the job of investigating the cases in 2011. The personnel files from churches in all 27 dioceses were to be examined for cases of abuse in an attempt to win back some of the Church's depleted credibility.

But now the Church has called off the study, citing a breakdown in trust. "The relationship of mutual trust between the bishops and the head of the institute has been destroyed," said the Bishop of Trier, Stephan Ackermann, on Wednesday morning.

The director of the KFN, Christian Pfeiffer, told SPIEGEL ONLINE that the Church had refused to cooperate. At the end of last year, he contacted the dioceses twice in writing. He reminded them of their promised transparency and cooperation. He also asked them whether there was any indication that in some dioceses files had been actively destroyed.