From the New York Times:

How the ‘War on Christmas’ Controversy Was Created

By LIAM STACK DEC. 19, 2016

It’s that time of year again, folks. It’s time for the War on Christmas.

What is that, you may ask? The short answer: a sometimes histrionic yuletide debate over whether the United States is a country that respects Christianity.

For the longer answer, keep reading.

The idea of a “War on Christmas” has turned things like holiday greetings and decorations into potentially divisive political statements. People who believe Christmas is under attack point to inclusive phrases like “Happy Holidays” as (liberal) insults to Christianity.

For over a decade, these debates have taken place mainly on conservative talk radio and cable programs. But this year they also burst onto a much grander stage: the presidential election.

At a rally in Wisconsin last week, Donald J. Trump stood in front of a line of Christmas trees and repeated a campaign-trail staple.

“When I started 18 months ago, I told my first crowd in Wisconsin that we are going to come back here some day and we are going to say ‘Merry Christmas’ again,” he said. “Merry Christmas. So, Merry Christmas everyone. Happy New Year, but Merry Christmas.”

Christmas is a federal holiday celebrated widely by the country’s Christian majority. So where did the idea that it is threatened come from? …

Fast forward 400 years, and the idea of a plot against Christmas gained wide publicity when Fox News promoted a 2005 book by a radio host, John Gibson, that alleged liberal antagonism toward the holiday, according to Dan Cassino, a professor at Fairleigh Dickinson University.