If it was biblical, then there would be very few who celebrate it.
Because the Bible says, the road to Jesus is narrow, and few will find/walk it.
However, Luke 1:5 places Jesus’ birth in the days of Herod, and Herod died in 750 AUC – four years before the year in which Dionysius places Jesus birth.
Pretty much anyway you take it, it seems very unlikely that Jesus was born in what we consider year 0. Fitzmyer – Professor Emeritus of Biblical Studies at the Catholic University of America, member of the Pontifical Biblical Commission supports this idea:“Though the year [of Jesus birth is not reckoned with certainty, the birth did not occur in AD 1. 130–202) viewed Christ’s conception as March 25 in association with the Passion, with the nativity nine months after on December 25.
In the lead up to December 25 Christians around the world prepare to celebrate the birth of Jesus Christ, a divine savior born from a human mother.
The earliest history of Christmas is composed of “pagan” (non-Christian) fertility rites and practices which predate Jesus by centuries. The New Testament gives no date or year for the birth of Jesus, and the first year was determined by Dionysius Exiguus, a Scythian monk, “abbot of a Roman monastery”.
So instead, they tried to incorporate all these pagan traditions and make them a part of Christianity.
The best example for this is the one with the Saturnalia – but that’s nowhere near the only case.
This is almost certainly the origin of caroling, and there are occasional mentions of this tradition all throughout the middle ages.
It was also a common habit for people to gather in groups and sing naked in the streets – really, these are the precursors of caroling.