For the first time social scientists have put an economic value on the activities of churches and charities.
A new study in America shows congregations are each doing work worth millions of dollars, especially through charity projects.
Reverend Dr Wilson Goode visits prisons in Philadelphia and appeals to inmates to sign up their children for his mentoring scheme.
He later matches the children to a mentor from a local congregation.
Among those enthused by Dr Goode's scheme is Marcus Teague.