The Eastern churches continued to celebrate
it on January 6th (which was also a pagan holiday)
In the 17th century, Christmas was banned
for a time in
England and in early America.
In the 19th century, most Christian churches
gradually adopted some
form of Christmas celebrations
That's where we stand today. Most Christian churches celebrate the birth of Jesus on
December 25th (whether
on the Gregorian or Julian Calendar) and a few, namely the Armenian church, on January 6th.