Phil Zuckerman spent 14 months in Scandinavia, talking to hundreds of Danes and Swedes about religion. It wasn’t easy.

Anyone who has paid attention knows that Denmark and Sweden are among the least religious nations in the world. Polls asking about belief in God, the importance of religion in people’s lives, belief in life after death or church attendance consistently bear this out.

It is also well known that in various rankings of nations by life expectancy, child welfare, literacy, schooling, economic equality, standard of living and competitiveness, Denmark and Sweden stand in the first tier.

Well documented though they may be, these two sets of facts run up against the assumption of many Americans that a society where religion is minimal would be, in Mr. Zuckerman’s words, “rampant with immorality, full of evil and teeming with depravity.”