Hi Vadim, very interesting post! I only recently learned that Russia celebrates Christmas so much later than other countries and now understand why because of you. - Regards, Kenton

Christmas celebration.

Let's consider, for example, the difference in celebrating Christmas between the UK and Russia.
First of all it's worth mentioning then the Christmas in Russia is celebrated on 13 days later than in the UK. In what way How did those 13 days appear?
Nowadays the Julian calendar is used either both in the UK and Russia. But [1] only one century ago in Russia the Gregorian calendar was used and it had difference with was different from the Julian calendar. After transitioning in Russia almost a century ago from the Gregorian to the Julian calendar, the Christmas remained in the Gregorian calendar.
In general, as far as I know, Christmas is more popular in the UK than in Russia [2]. In my opinion, in Russia the aforementioned feast is more religious than in the UK [3]. New yYear's celebration is more popular in Russia.

[1] It is okay to use "but" as the first word of a sentence, but it is generally avoided. I would suggest "However," in place of "But" to begin this sentence.

[2] I've noticed this as well from a Russian coworker!

[3] I'm not sure what this sentence means. Is there a feast you've mentioned in another post? What do you mean by "religious"?