Even though we're behind Europe in religiosity and far behind the US, Orthodox Christianity was alive and well here after the fall of the SU, and Christmas and Easter are variously observed. It's rather notable that despite the Bolsheviks' no-nonsense and literal approach to eradicating religion, Christianity and the church have survived the Soviet era pretty well. One reason for this is said to be that in the ramp-up to the Great Patriotic War, the government dropped the anti-religious rhetoric and adopted instead the position of ‘unite and defend your motherland and the people’.
Add to this the fact that in the 70s and likely later, people were still migrating from rural villages to the cities, with the whole baggage of inherited religiosity and mishmash of folk beliefs. My grandmother put in plenty of time in prayer each day. Icons or whole arrangements of them are a feature in many homes, cars and sometimes, more rarely, offices. And I still receive messages from my parents each year, commemorating birth and then the resurrection of Christ. Folk culture doesn't tend to follow an official doctrine, as exemplified by troves of Soviet jokes—and is also not big on ideological clarity, so many didn't see a problem in subscribing to both socialism and Christianity, along with crystal healing, magical powers of thought and a bouquet of other fringe beliefs.
In the 90s, my home city already had a bunch of churches including at least one large temple, and one or two monasteries—and I don't think they popped up recently.
Notably also, even Bolsheviks preserved old and unassuming Karelian wooden churches, recognizing them as architectural and cultural monuments—while demolishing some huge temples in Moscow. Like the Kondopoga church, built in 1774 and which somebody burned down in August of 2018: https://commons.wikimedia.org/wiki/Category:Church_of_the_Do...
https://en.wikipedia.org/wiki/Dormition_Church,_Kondopoga