Ted Diadiun opened his Jan. 25 column on Aaron Baer’s appearance at the City Club (“City Club Forum with Aaron Baer featured strong opinions, not hate”) with the question, “What is hate?” I begin this letter with a question more to the point: “What is Christian?” Baer spoke on behalf of what he calls the “Center for Christian Virtue.” But what is Christian? You might think it had something to do with Jesus, the biblical figure for whom it is named.