When the “Dutch Catechism” appeared in 1966, it quickly became a best seller in part because its style was so different from the “Baltimore Catechism” commonly used by American Roman Catholics. Whereas the Baltimore Catechism was written in a point by point style, the Dutch Catechism was written as a narrative, attempting to show the relationships between Catholic doctrines.

Source: Religion in American History: An Unlikely Bestseller: The Dutch Catechism in 1960s America