Book excerpt: Does our available evidence show that some particular religion is correct? It seems unlikely, given the great diversity of religious - and non-religious - views of the world. But if no religious beliefs can be shown true on the evidence, can it be right to make a religious commitment? Should people make 'leaps of faith'? Or would we all be better off avoiding commitments that outrun our evidence? And, if leaps of faith can be acceptable, how do we tell the difference between goodand bad ones - between sound religion and dogmatic ideology or fundamentalist fanaticism? Believing by Faith offers answers to these questions, inspired by a famous attempt to justify faith made by William James in 1896. In doing so, it engages critically with much recent discussion in the philosophyof religion, and, especially, the epistemology of religious belief.