A month away from the Vatican’s sexual abuse summit and the smell of failure is in the air, emanating not from the Holy Father’s critics but from his supporters.

And that was before an exclusive Associated Press report raised serious questions about the credibility of Pope Francis in relation to the case of Bishop Gustavo Zanchetta, his Argentine protégé who, after resigning from his Diocese of Oran, was given a senior Vatican post.

The key challenge for Vatican officials in the next few weeks will be to limit the damage the summit will do, now that the credibility of the Holy See itself has been so severely damaged.