For another anti-commercial Christmas parody, Tom Lehrer's "Christmas Time" is in the DT--search for "hunks of holly".

Tim is generally right about the Magi, but the modern Zoroastrians in Bombay are called Parsees. (Though of course it's the same word as "Farsi", and means Persian.) And they don't worship fire any more than Christians worship crosses, but they regard fire as a holy symbol of the good god Ahura-Mazda, a.k.a Ormuzd and probably other names. Zoroaster or Zarathustra was the ancient Persian prophet who founded the religion.