This certainly makes my unabashed love of Christmas Carols seem less traitorous:
The following Christmas carols were written by Jews: "O Holy Night" (Adolphe Adam), "Christmas Song" (Mel Torme), "White Christmas" (Irving Berlin), "Let It Snow, Let It Snow, Let It Snow" (Sammy Cahn and Jule Styne), "Silver Bells" (Jay Livingston and Ray Evans) and "Rudolph the Red-Nosed Reinder" (Johnny Marks).
And, as Safron Foer (who wrote the guide to Christmas this is lifted from) points out, Jews made the biggest contribution of all: the birthday boy.