Sarah Harbaugh remembers the first time she was asked the question.
As a student at Gibault Catholic High School in Waterloo, Ill., one of her teachers, a sister with the Adorers of the Blood of Christ, asked Harbaugh if she had considered religious life.
She laughed a little and said, "No."
Harbaugh, 25, has been out of high school for eight years now. Earlier this year, she ran into that sister, who told her again that she needed to think about the possibility of a...