Faith is typically based on “belief” and science is based on objective research and analysis. In this address, written for the Malvern (United Kingdom) Science and Faith conference, Dr. Ray discusses the concept of “evidence based faith,” attempting to rank our beliefs based on Bayes’ Theorem of probability analysis. This invites communities of faith to put the majority of their energy into what they can know (indeed, what they can hardly avoid knowing from the news!) rather than stressing the unknowable truth claims of traditional religion. We have no real evidence of heaven and hell but we have lots of evidence of racism, poverty, violence, and illness.