Maremia
I agree with you MOnica. People trying to make sense of the events and tragedies happening around them.
Many of our ancestors were Pagan before new religions evolved.
It makes sense, to me, that we merged old and new traditions.
As no-one seems to be sure when Christ was born, it seems sensible to have fixed the date around the date of another festival in mid-winter when, in the Northern hemisphere at least, it's cold, dark and miserable and people need cheering up.
It doesn't work so well in the Southern Hemisphere though!