How did such a profoundly Christian film --so much more Christian, for that matter, than the smug instructions being handed down simultaneously on US television screens by Billy Graham and other enemies of Soviet godlessness-- get green-lighted by Mosfilm in Khrushchev's USSR? Watch Andrei Rublev and you'll sense what an irrelevant blip in Russian history godlessness in fact was.
Deeper than this, though, it is not only a Christian film, but an Indo-European film and a pagan film as well: not pagan in any sense that Billy Graham could have understood well enough to oppose, but in a sense that only continues to have any meaning where Christianity remains, as practitioners of Orthodoxy like to describe it, primitive. You will never see animal abuse in a Hollywood production that comes close to what Tarkovskii put the horse through in the scene depicting the Tatar raid of Vladimir (segment #11 on YouTube). You will also never see such an appreciation of the beauty of horses, those Eurasian creatures, as Tarkovskii shows.
Jonathan Hoberman seems to detect the animistic spirit of the film when he cites the horse falling down the stairs as an instance of Tarkovskii's desire to capture the 'undirectable', which I take to be nature itself. Hoberman calls the film a "pre-Soviet theater of cruelty charged with resurgent Slavic mysticism," and stresses the us-them dichotomizing so familiar in the Russian popular imagination. For him the film is "founded on the conflict between austere Christianity and sensual paganism-- whether Slavic or Tatar." But even Stalin approved the familiar proverb about scratching a Russian and finding a Tatar underneath, and in the scene with the idiot girl running off with her Tatar occupiers Tarkovskii offers a sort of myth of origins for this layered identity. As for Rublev's encounter with indigenous Slavic pagans in the middle of one of their ritual orgies, he too appears to give in and join them, spending the night with the young witch Marfa.
The final scene (the only one in color) shows, I think, at least two of the layers of spirituality that animate this film (though you must watch it until the end to see this).