Prothero and others have found a shocking lack of knowledge about the religions to which Americans purport to belong, bested only by their ignorance of religions to which they don't belong.
Surveys say only half of America's adults can name any of the four Gospels. Most Americans can't name the first book of the Bible.
Only one-third know that Jesus (not Billy Graham) delivered the Sermon on the Mount, and most Americans think Jesus was born in Jerusalem. (It was Bethlehem.)
What is especially interesting, however, is Professor Prothero's discussion about the lack of religious knowledge even among the faithful:
In this country, Christianity, in particular, has migrated from doctrinal and narrative components to a focus on religious experience that doesn't appear to require a knowledge of the Scriptures, Prothero believes.
''Being a Christian has become synonymous with having a born-again experience or opposing abortion and stem-cell research,'' he said. ''American Christians focus on loving Jesus rather than learning what he taught.''
. . .
The problem is not hypocrisy, Prothero says, so much as ignorance.
''When I give my students the religious literacy quiz that's in my book, I find Catholics who don't know the Seven Sacraments, Protestants who can't name any of the four Gospels and Jews who can't name the first book of their Bible. That doesn't make them pseudo-religious. It just makes them believers who don't really know what they are believing in,'' he said.
Prothero's prescription is apparently more non-sectarian education about religion in schools . In my view, however, Prothero's survey suggest that churches themselves need to do a better job of educating their own members about their own faith.