Skeptics must learn to look for a type of faith hidden within their reasoning. All doubts, however skeptical and cynical they may seem, are really a set of alternate beliefs. The reason you doubt Christianity's Belief A is because you hold unprovable Belief B.  Every doubt, therefore, is based on a leap of faith.

Tim Keller, The Reason For God: Belief in an Age of Skepticism (Dutton Adult: New York, 2008), xvii.