Given as a talk to the Friends of Augustine, a lay group, at Clare Priory, Suffolk, England, in April 2003. A modified version was published in Review for Religious 62.4 (2003) 354-362. Today, one feels, disbelief in God has become a source of anxiety. The onus has now switched to those who claim they do not believe in God to prove their unbelief. Indeed, the stridency with which non-believers and secularists proclaim their ‘faith’ suggests an anxiety about their unbelief w