The Mormon church says this is a question often asked by those who wish to denigrate Mormonism; it refers to the Mormon belief that God is the father of all.
During my visit two expressionless Mormon "home visitors" wearing identical shirts and ties turned up and whisked Dustin, Ruth and their two-year-old son into their bedroom for counselling.
Antipathy towards Mormons is rarer among well-educated Americans (64% of college graduates have a favourable view of them) and among people who actually know a Mormon.
