Once again, no, it's not. I'm telling this as someone who shares the same cultural identity as Yulia and who was brought under the same cultural and national traditions. Saying Jesus has Risen or posting a picture with a cross online doesn't have the same significance in Russian culture as it does in other cultures, even Eastern European ones. During Easter time and Christmas my newsfeed on social media is filled with these kind of pictures. I realize it is different in other Eastern European countries (especially Poland and Serbia), but in Russia even those who are not religious at all would post them on holidays. Yes, crosses, doves and church pictures included.
I am not debating Yulia's faith or anything, just asking you not to draw conclusions based on these images. People tend to assign meanings to signs based on their cultural heritage and knowledge, and in some cases, they lack context and insights to do so. In Russia a lot of religious traditions and customs became indeed a part of the national identity and customs. So even non-religious people would observe them (me included). In some sense being Russian equals being Orthodox. With 80% of population being baptized and observing all the religious holidays you would hardly find anyone who goes to church more or less regularly or even knows a prayer. I know it sounds crazy, but that's what it is. And as Alexz pointed out, "I'm Orthodox, but I'm not religious" phrase is really very common.
I share pretty much the same impression of Russian religious heritage. It's more about their traditions than about personal faith issues.
I know for the fact that even Russian priests advising parents don't drag their kids to church forcefully. Going to church should be voluntary and in a good will. Their point of view on a religion is more about how important it is to be baptized (wear a cross on the neck, as some sort of good luck charm medalion or as a personal guardian angel) and to be a good kind person, than to blindly follow religious dogmas. An may be later, with age you know, if the person chooses to visit church more often, she/he can follow spiritual calling further.
They not always follow Bible literally down to the very T, like our devoted Christians in US, which taking it to extremes sometimes. In Russia personal and depth faith is a very personal business. You would never be for example stopped on the streets or in the mall and be preached on in Moscow, religious agitations in public places are also usually a big no-no (not that I find evangelism a bad thing in US). Russian civil society simply agreed on not making a big deal on religion choices of each other and compare degrees of spiritual devotion. It will be considered to be a very vulgar and immoral thing to judge someone of being a "bad Christian or too sinful" or try to convince someone to be more or less religious in modern Russia.
It's a very very personal mater in Russia, at least currently. Even people, who very vocal and upfront about being atheists, could be a very close with their devoted Christian friends which on contrary can happen to be extremely spiritual and righteous. Heck, they even can visit each other during religious holidays, share a meal, play along some fun national traditions, or just dine out all together with their families. Even Russian atheists can go to church on big religious holidays sometimes, they can just be a simple spectator and just enjoy the choir and ceremony. No need to pray or smth. Just behave as a cultural person, common sense you know.
And yep, in Russia it's considered to be completely fine to post religiously-themed celebratory pics on holidays even for nonbelievers. It's more like a holiday fancy postcards for them. However they still usually showing complete respect and acceptance of those how are very serious about faith (whatever denomination it can be).
Russia has a successful track record of peacefull coexistence of Islam, Christianity and Buhdism under one roof for many centuries. Certainly it was not very smooth back in 14th century or few small regions on a South. But regions like Tatarstan, Buryatiya, Bashkirstan, Kalmikiya has a very friendly and unique I would even say peaceful society of people of different religions or nonbelievers. Especially in Kazan (Tatarstan) Christian churches and Muslim moscas are located literally across the street from each other. So on big dates families of different religions can visit their own temples and shortly after services (be it muslim or christian) they can meet, congratulate each other, dine out or spent time together over a holiday meal at home. Even if you are agnostic or simply not spiritual/nonbeliever, you are always welcome to join and celebrate (or not) whatever you want on that day. Usual potluck courtesy rules and casual BYOB applies, Russians never show up empty handed, btw. They might a bit cold on outside first, especially in big metropolises like Moscow or St Petersburg, but if you are invited into their house, it's usually over-the-top hospitality, you better eat everything offered.

Some social lubricant in a form of wine will win you a friend for life. Big religious holidays are federal holidays anyways, no one is working, everything is closed, except essentials like gas stations, medicals and similar (only greedy grocery store owners are asking their employees to work disregarding.. [emoji38] ).
Certainly church officials as pretty much everywhere trying to have a bigger influence on society and intervene every now and than, but it's most of the time just the opinion of some priest or the patriarch and calling to the nation to be kind, to follow traditions, to be more tolerate and etc. Which is nice. However, some public statements or scandalous interviews by sometimes too religious individuals can happen, sometimes they may sound really like taking it too far. Civil society usually frowning upon those, they making fun on their account themselves.
Here in the States many subjects are taboo, like politics and religions, racial and ethnical tensions issues. No such thing in Russia as political correctness, they like to discuss pretty much anything. Even very heated debates about politics are common. Needless to say, virtually anything is up for a good laughing out. But it's the harassment and arguing over personal choices of faith/spirituality/lack_of_it they don't really like. Especially if it's in the form of agressive pressure not from within their own secular civil society. In short: they think everhitng works very well already, no need to change a thing.