It is almost a doctrine of the church that no one knows the birthday of Jesus, and that Dec 25 was chosen to replace pagan holidays that took place during the shortest days of the year.
It’s as good a day as any other.
It’s more important to enjoy it and resist present-day pagan influences than to worry about the right date.
Who said I was worrying? Nevertheless, if you read the article, you would see that celebration of the 25th of December predates the “replacement” of the Roman festival by at least 227 years.