Those who believe in God, and those who don't, have access to the same 'evidence', but they view it, weigh it and interpret it differently. This book explores the nature of belief in general, and in science and God in particular. What factors shape our beliefs? How fixed or adaptable are our beliefs? How do we know anything, and how do we know that we know it? How do we judge between different interpretations of the same thing, i.e. different truth claims? What do we understand by the terms 'belief' and 'faith', and to what extent is even science - generally taken to be fully objective and rational - influenced by how we believe things. In turn, what do we mean by 'faith in God', and how are faith and reason inter-related? Finally, how useful is it to think of religious faith as a journey rather than something fixed and unchangeable?