All that guff really amounts to is the anti-Christ crowd waving the white flag. "Since when were we having people not say 'Merry Christmas'?" ("Revisionists? When were we ever revisionists?") One is put in mind of the Soviets, another notably left of center group, announcing there had never been a Soviet-American race to the moon -- shortly after July 1969.
Recall that this matter did not start this year, but last year at about this time. This December there was more noise made about it, and it seems to have had the desired effect.