It may be jolting to American Christians, at least, to speak of "Holy Russia". It smacks of a bad kind of patriotism, and it invites the same kind of response that has some devout U.S. Christians answer "God bless America!" by saying, "America, bless God!", or "God bless America... and China... and Guatemala... and Ghana... and..." Why besides the wrong kind of patriotism would some writers speak of "Holy Russia"?
The earliest story among the "founding legends" of U.S. national consciousness were of devout, faith-filled, and profoundly moral pilgrims leaving England to practice their faith on what would become U.S. soil. Before the Boston Tea Party, before the cry of, "No taxation without representation!" or the shot heard round the world, before any other legendary event is the story of pilgrims seeking to live their faith as purely as they could. Do the legends give us reason to speak of the U.S. as holy land? The devout American Evangelicals I know wouldn't dream of it: when they say "holy lands", they very clearly mean, "the lands of Christ and the Bible." It wouldn't occur to them to use the term "holy land" to mean "land of the pilgrims' pride" or the lands of history like the Great Awakening.
But you are missing something about Christ if you think his Incarnation is limited to when his Mother conceived him; the Incarnation of Christ unfurls in his saints, and the purpose of becoming Christian is to become a little Christ, and become by grace what God is by nature. Equally, you are missing something about holy land if you think that Christ by living on land may make it holy, but Christians cannot do anything like this. The prolonged effect of many saints over many years is to lift their land up to God, and the Gospel that reaches out to the whole earth