In the days of the Soviet Union, Christmas was not celebrated very much. New Year was the important time. Now Christmas is normally celebrated on January 7th (only a few Catholics might celebrate it on the 25th December).The date is different because the Russian Orthodox church uses the old 'Julian' calendar for religious celebration days.The Orthodox Church also celebrates Advent.he official Christmas and New holidays in Russia last from December 31st to January 10th. In Russian Happy/Merry Christmas is 's rah-zh-dee-st-VOHM' (C рождеством!) or 's-schah-st-lee-vah-vah rah-zh dee-st-vah' (счастливого рождества!). Happy/Merry Christmas in lots more languages.