The Elliott Review was commissioned in September 2015 to look into alleged sexual abuse committed against a man during the 1970s.
His claims were made to a number of different people on separate occasions through the intervening years, both within and outside the Church, but no action was taken.
The survivor said he had "not received a response which he felt adequately addressed his needs".
Senior members of clergy questioned said they did not remember the allegations being made, something, the report says, is "hard to accept".
It added: "Practice of this nature is simply not acceptable and must be addressed. All who find themselves to be in this position must know what to do and must have some understanding of how they should respond.
"To have no records and to rely entirely on memory is simply not good enough."
The survivor has since been offered an unreserved apology and a settlement amid further efforts by the church to repair the damage caused to him.