Christmas, for the pious residents of eighteenth century Williamsburg, would have been perceived as a Popish plot.
"ChristmasSunday", the Sunday before or after the 25th, might have been alluded to in preaching, but to celebrate the Day itself would have been seen as a sell-out to Romish superstitions.
As for the Christmas tree, it was Queen Victoria's consort, Albert (Was he a German Lutheran?), who brought the first Christmas tree from the Continent to England, whence it made its way to North America, in the mid-nineteenth century.
ChristmasSunday is the Sunday nearest to Christmas.
In the United Kingdom between 1954 and 1993, if Christmas Day fell on a Saturday, 26 December was referred to as ChristmasSunday, and Boxing Day was observed on 27 December.
However, this practice has fallen out of use : in 1999 and 2004, 26 December was called Boxing Day even though it fell on a Sunday.