Decades ago the man who claims to have killed Etan Patz may have unburdened himself to a prayer group. But they did nothing, according to alleged killer Pedro Hernandez’s sister and Tomas Rivera, the New Jersey prayer-group leader. Rivera told The New York Times that he never reported Hernandez’s story to police because he confessed “to the group,” not to Rivera individually. Rivera said that last week he was visited by New York City Police Department detectives who questioned him about the case. The New York Post reported Sunday that sources say Hernandez hid 6-year-old Patz’s body in a walk-in refrigerator before disposing of it after the 1979 killing. Hernandez was a stock boy at a SoHo bodega at the time.