Your husband was correct. The numbers (which at times as been 20,000, or 25,000, or other sums), are ultimately derived from an academic source. The calculations for that total number are done in an idiosyncratic manner, and a peculiar definition for the term “denomination” by the folks who put out a series of reference books, primarily The World Christian Encyclopedia. Here’s a statement they made, when someone questioned how their total was arrived at, for each updated edition:
*Thank you for your inquiry. I can assure you that the figure of 39,000 is in no way inflated. This number represents our most current, up-to-date data. As we are constantly updating this figure, it is not published in print form. The figure of 33,800 from the year 2000 was printed in our book World Christian Trends, (Pasadena, CA: William Carey Library, 2001). Part 12 of World Christian Trends (WCT), Table 12-1 gives figures of denominational totals for all 238 countries of the world. These figures are also represented graphically in WCT on page 917, Global Map 14. The definition for denominations used in WCT, and also in our publication World Christian Encyclopedia (Oxford, 2001) is as follows:
“Any agency consisting of a number of congregations or churches voluntarily aligning themselves with it. As a statistical unit in this survey, a ‘denomination’ always refers to one single country. Thus the Roman Catholic Church, although a single organization, is described here as consisting of 236 denominations in the world’s 238 countries.”*
More precise listings of denominations can be found in the World Christian Encyclopedia, under the article for each country.
Still, a lot of denominations, to be sure. But using the total figure reflects a misunderstanding of the source.
GKC