Pride House: The Quest for Vainglory — Rob Summers

They drive cars, use cell phones, and shop at the mall, but they're allegorical characters with names like Pride and Faith. The series tells the story of cousins Reason and Dignity, and of their life in an old house in the midst of a godless City. Fast paced and often funny, each book is a cross between Pilgrim's Progress and a humorous modern novel.
In book 1, young Mr. Pride marries Miss Doubt, grieving his cousin Miss Reason; and soon Doubt persuades Pride to welcome into Pride House her friends Worry, Tedium, and Confusion. Then, to make matters worse, Pride becomes infatuated with Miss Fame Vainglory, the City's most desirable beauty, and will do anything to win her love. Though Reason could get help from Faith Orchard and her Heavenite family, it might cost the cousins their reputation as good citizens. Besides, the Orchards want her to consult with Pastor Truth, and she has never met such an opinionated man!