The War on Christmas probably has its roots in liberalism and the upsurge in Kwanzaa celebrations. As long as America was primarily populated by Christians and Jews, there was no problem discussing Christmas or wishing others to have a merry one.
However, America, a land once ruled by the majority, has become a land where the minority hold all the cards and get all the rights. As the profile of Muslims and Kwanzaa has raised substantially in recent years (one because of their aimless and random attacks on innocent people), Christmas, somehow, became an exclusive domain of whites (probably those EEeeeeeeeeevil heterosexual white males - the ONLY group that has not been protected through hate crime laws).
The War on Christmas is not simply one of perception, it is one of fact. The fact remains, however, that the majority of Americans consider this "happy holiday" season to be Christmas.
Kwanzaa is made up BS and to give it moral equivalency with Christmas and Chanukah is BS. Whenever an institution promotes Kwanzaa we should insist equal time for Festivus!