The date of Christmas goes back to the winter solstice, which - according to the Julian calendar - took place on 25 December.
This is why the Ancient Romans celebrated the birthday of their sun god Sol Invictus on this magical day from 274 AD,
while the Christian holiday is not documented until 336 AD.
When the Protestant reformers came along, however, they remembered the origin of the date and believed that the festival of Christmas
also sprang from pagan custom. They therefore renounced it. It went so far that it was actually banned in Geneva and Scotland in the 16th century.
A ban on the Christmas festival was also pronounced in England in 1647. Then, however, Christians of all denominations accepted it.
And the European Protestants actually took to it so much that they introduced the Advent wreath and the Christmas tree.
These were initially considered to be Protestant things and were only adopted
gradually by the Catholics.
More about this day can be found HERE