Christopher Hutton argues that doubt and skepticism are not just for atheists and agnostics, but should be embraced by Christians as an integral part of a fully-lived faith:
Doubt is a thing which many Christians see as opposing their faith. Many have fought it and its prevalence in the modern minds of man. 19th century pastor Robert Turnbull once stated that “Doubt, indeed, is the disease of this inquisitive, restless age.” Many people react negatively towards any feelings of doubt that they may have, fearing that this doubt means that they aren’t fully committed to God.
However, this fear of doubt is dreadfully dangerous. Not every man who doubts his faith loses it. And if they look at most human lives, they’ll find that if one doesn’t doubt, then one isn’t human. It is a necessary idea for any believer, for it acts as the catalyst and tool for a man or woman to grow.
He goes on to highlight this passage from Timothy Keller:
A faith without some doubts is like a human body without any antibodies in it. People who blithely go through life too busy or indifferent to ask hard questions about why they believe as they do will find themselves defenseless against either the experience of tragedy or the probing questions of a smart skeptic. A person’s faith can collapse almost overnight if she has failed over the years to listen to her own doubts, which should only be discarded after long reflection. Believers should acknowledge and wrestle with doubts—not only their own but their friends’ and neighbors’.