>> a rapidly emerging influence on chinese society is christianity. that might be surprising given china's communist system. but fox religion correspondent lauren green reports the numbers don't lie. >> this is the face of china in transformation. officially atheist country with more than a billion souls experiencing explosive 100-fold increase in increase in christianity. >> this is a result of the spiritual vacuum that occurred because everybody is fed up with the marxist and leninism and mao thought. >> greatest came after the tiananmen square crackdown. based on the registered churches the chinese government claims it has 28.6 million christians but off the record, communist party members admit the real number is between 80 to 150 million. many belong to undocumented