There is no questioning the data: Buddhism is a force to be reckoned with. Estimates of the number of practicing Buddhists around the world ranges from 350-million all the way up to 1.6 billion.
Buddhism is also recognized as one of the fastest-growing religions in the world. A University of Michigan professor has spent the past 12 years putting together what's being hailed as the most authoritative and comprehensive reference on Buddhism ever produced in English. It is "The Princeton Dictionary of Buddhism," co-authored by Robert Buswell of UCLA, and Donald Lopez. He is the Chair of the Department of Asian Languages and Cultures and he is a Distinguished Professor of Buddhist and Tibetan Studies at the University of Michigan.