Atheism, I began to realize, rested on a less-than-satisfactory evidential basis. The arguments that had once seemed bold, decisive, and conclusive increasingly turned out to be circular, tentative, and uncertain. The opportunity to talk with Christians about their faith revealed to me that I understood relatively little about their religion, which I had come to know chiefly through not-always-accurate descriptions by its leading critics, including British logician Bertrand Russell and German social philosopher Karl Marx. I also began to realize that my assumption of the automatic and inexorable link between the natural sciences and atheism was rather naïve and uninformed.
–Alister McGrath, Atheism, Christianity, Religion, and Science