"Of course Pope Francis has established he is part of the problem," Peter Saunders said in an interview with AFPTV, during which he insisted he had not resigned and that only the pontiff himself could force him to quit the Vatican commission.
"That breaks my heart because when I met him 18 months ago I thought there was a sincerity and a willingness to make things happen, and I am afraid that has been dashed now."
His involvement, along with fellow survivor Marie Collins, helped burnish its credentials as a symbol of the Church tackling the abuse head-on.
But Saunders now says he realises the commission was always going to be about "smoke and mirrors" and that he is convinced the Church will never act alone to cure the "cancer" in its midst.
More From This Section
The Vatican confirmed earlier today that Saunders, 58, had been asked to step down from the commission because of disagreements over whether the 17 members should get involved in individual abuse cases brought to the Church's attention.
"I have always said I will speak my mind and exercise my right of free speech and that really isn't compatible with the way the Church and the Commission operates," Saunders said.
"It is also at the heart of why abuse within the Church is still so rampant and widespread."
He added: "It is because everything has to exist under conditions of secrecy and darkness and I am not prepared to work like that and I am not prepared to be silenced on an issue as important as child protection."
The case has since been referred to the Vatican for further investigation.
"Now, I find that beyond unacceptable that men doing the right thing protecting children should both be sent away by the police but more significantly and sinisterly... To be told by their boss, the bishop, they must do nothing and to remain silent," Saunders told AFP.