This it it: I have tried to maintain a certain degree of poise and charity despite the fact that Pope Benedict XVI is celebrating Mass on Sunday at Yankee Stadium (altar mock-up at right) and ignoring Shea. Full disclosure: I am a lifelong Mets fan. That is my pride, and, of late, my shame. But now Cardinal Egan rubs salt in the wounds, telling the Daily News that he’s a convert and that the Yanks are “the greatest baseball club in the world.” Moreover, the Chicago native has apostasized, dumping the Cubs: “I was a Cubs fan all my life until I came to New York and was converted,” said Egan.