POLINA NIKOLSKAYA and ANDREW OSBORN  KREMLIN critic Alexei Navalny lost his appeal on Saturday against what he said was a politically motivated decision to jail him for nearly three years, but said his faith in God and belief in the rightness of his cause was sustaining him. Navalny, President Vladimir Putin's most prominent critic, was jailed earlier this month for parole violations that he said were trumped up. Western countries have condemned the case and are discussing possible sanctions on Russia. A Moscow court swiftly rejected Navalny's appeal on Saturday, while shortening his original jail term by six weeks. The…