The small group of Chinese Catholics who crossed the border to see Pope Francis covered their faces for fear of reprisal. Church officials blamed the Communist government for preventing mainland China’s bishops from coming to see the pope. And diplomats said that China had watched the pope’s activities closely, and warily. Yet as Pope Francis returned to Rome on Monday from a four-day trip to Mongolia, he had nothing but positive things to say about China. “The relations with China are very respectful — I personally have great admiration for…