NEW YORK (AP).- A cross-shaped steel beam found amid the wreckage in the days following the Sept. 11 terrorist attack was a symbol of hope for many working on rescue and recovery there, so much so that the construction worker who discovered it believes he stumbled on to a miracle. “I saw Calvary in the midst of all the wreckage, the disaster,” Frank Silecchia recalled Saturday. “It was a sign … that God didn’t desert us.” The 2-ton, 20-foot-high T-beam has now become a religious relic. It was taken from its temporary post near a church Saturday and lowered 70 feet down into the bowels of where the twin towers once stood to become part of the exhibit at the National September 11th Memorial and Museum. But for all the religious fervor surrounding the cross, it will become part of the museum because of its history at ground zero, not because of its Christian symbolism, museum officials said. “It’s powerful because it provided comfort to so many people — it is a part of the h