From a frenzied fan’s viral TikTok to a city lawmaker greeting fans at a music festival, the cry has echoed across New York City over the last week: “My mayor Muslim, my bagels Jewish, my Christian Dior — Knicks in four!!” On Monday, the last line was rendered obsolete after the San Antonio Spurs interrupted the New York Knicks’ hopes for an NBA Finals sweep after two wins. But the idea behind the chant — that the Knicks’ chances at their first …