Taoism is one of the great religions of the world. It is an Eastern religion/philosophy with perhaps 225 million followers. The exact number is impossible to estimate because many of its followers also identify with other religions -- often Buddhism and Confucianism -- and because it is impossible to obtain reliable polling information from individuals in China.
Taoists were heavily persecuted in China after the Communist victory in 1949, and during the cultural revolution from 1966 to 1976. Some religious tolerance and freedom has been experienced over the last three decades.