May 11, 2001 Repression at the hands of China provides the thrust for each of two documentaries that open today at the Two Boots Pioneer Theater (155 East Third Street, East Village). Earnest and well-meaning but unexceptional, they are Danny Schechter's "Falun Gong's Challenge to China" and Robin Garthwait's "Tibet's Stolen Child." [...] [...] The film provides ample testimony that, contrary to China's position, Falun Gong is not a [slanderous term omitted]; and photographic evidence and oral statements support Falun Gong's contention that China's government has tortured its followers. Though given to repetition, Mr. Schechter pursues his story in journalistic fashion, with film of the Falun Gong founder, Li Hongzhi, comments by high Chinese officials and an effort to trace the history of their conflict as well as to glimpse the future. [...]