A worthy point:
83% profess faith in the Russian Orthodox Church (2013), but only 41% in another survey (2012)... what’s going on?
Well, your survey allowed the option for people who believed in God and were spiritual to define themselves as such, whereas the one I cited forced people to pick which religion they belonged to or state they were atheist.
I think it’s quite fair to say that about 42% of Russians identify with the Russian Orthodox Church politically, socially or even simply ethnically, yet haven’t accepted the entire belief system of the ROC. Sorta like the fact that 87% of Americans identify as Christians, but less than half associate with any specific denomination.
Nonetheless, even this represents fantastic growth, and completely obliterates the notion that Russia is becoming Islamic.
There is some obvious discrepancy, even still, however: Adding all “spiritual but not religious,” “undecided” and “unaffiliated Christian” still only gets you to exactly 83%, and I doubt 100% of the people in those categories see themselves as ROC. Looking into it, I think a 2012 Levada poll that found 73% are ROC is probably a more reasonable estimate of how many people have any affiliation with the ROC.