Can it be justifiable to commit oneself 'by faith' to a religious claim when its truth lacks adequate support from one's total available evidence? In Believing by Faith, John Bishop defends a version of fideism inspired by William James's 1896 lecture 'The Will to Believe'. By critiquing both 'isolationist' (Wittgensteinian) and Reformed epistemologies of religious belief, Bishop argues that anyone who accepts that our publicly available evidence is equally open totheistic and naturalist/atheistic interpretations will need to defend a modest fideist position. This modest fideism understands th