"In Defence of Doubt" was the title of Dr Val Webb's 2013 tour of the UK. It is also the title of her best known book. In this excerpt from one of her talks she rejects the idea that faith and doubt are opposites.
Part of the problem is that, traditionally, doubt has been promoted in hymns and sermons as the opposite of faith or belief. St. Francis’ popular prayer says, where there is sorrow, bring joy; where there is doubt, faith. Hymns about “driving the dark night of doubt away” reinforced this dichotomy. Yet the opposite of faith is to be without faith. The opposite of belief is unbelief. Neither equate with doubt.