Back in the 1920s, a comedy called “Abie’s Irish Rose,” about a Jewish boy married to a Catholic girl and the havoc that plays among their families, ran for more than five years on Broadway in spite of terrible reviews. (“People laugh at this every night, which explains why democracy can never be a success,” wrote Robert Benchley, then a Life magazine theater critic.) In 1972, CBS revived this concept as “Bridget Loves Bernie,” about a Jewish boy married to a Catholic girl, etc., etc., whose intermarriage theme occasioned some controversy, though stars David Birney and Meredith Baxter later we…