Speaking during the commemoration, Onaiyekan expressed sadness that the students were still in the hands of their captors.
"The Joint Task Force kept telling us that it had combed the Sambisa Forest where the abductors alleged to have kept the children, but we have not got an inkling regarding their whereabouts,'' he said.
He expressed hope that the 500 days would be a symbolic catalyst to move the Nigerian community into recognizing the serious problem on its hands and finding a solution.
"I have always identified with this group. That is the reason I came this day; we are commemorating the 500 days they, Chibok girls, were abducted. This is a serious matter. Our girls taken from us," the cardinal said. "I am here because I am worried about the girls whose condition we don't even know. We don't even know what state they are in, and it is painful."
Onaiyekan called on Nigerians to understand the magnitude of the issue of the abduction and pray for the students' safe return.
"I thought that this whole place would be congested, but I was terribly disappointed, this whole thing doesn't seem to hit the hearts of Nigerians unless we are lucky that the media carries it tonight and amplifies it, so the country hears that something happened here today."
He said he had not planned on going to the commemorations but had received a call from Vatican Radio asking him about it. He said he told Vatican Radio he hoped 500 days would "be a symbolic catalyst to move the Nigerian community into recognizing we have a serious problem. My heart bleeds for the young ladies, the fact that they called me from Rome means that they have not forgotten, it is we that have forgotten."
Sheik Khalid said his presence at the commemoration was to tell the world that the Muslim faithful were always ready to unite with their Christian brothers and sisters to fight for the soul of the country.
"I want to challenge all the imams that we should use our purpose to fight for the freedom of the Chibok girls, we must tell the world that Boko Haram will never succeed and they are not winning and Nigeria will win this battle, we are peace lovers, we are peace workers and we shall die as peace workers,'' he said.