Possibly, but that number is exponentially rising in Russia as in all the nations where there are muslims.
So what is 15% today, shall be over 50% in half a century and as such shall have the majority vote.
Likewise, all of Europe has a ratio of child births to married couples that is under 1.9. Which = guaranteed to become extinct as such.
So maybe a part of Russia doesn't fall under a population that is a majority muslim, but that again would mean that the map of Europe as such and the populations shall change drastically.
Again aligning to the overall fact that by the end of this century Europe shall have islamic laws by majority vote.
No avoiding it any more.
Population figures, growth, decline, immigration.
As far as ideology goes, that is a totally different and yet parallel ballgame.