Webtim keller says both believers and unbelievers need to confront questions about christianity. Belief in an age of skepticismβ, p. 17, penguin. While we want doubts to give way to faith, we should be merciful and patient. Webstephen bedard, march 31, 2013. Many christians believe all doubt is bad. I really like what tim keller shares in his introduction to the reason for god. βa faith without some.