33,820 is the number of denominations/paradenominations reported in the 2001 Second Edition of Barrett's World Christian Encyclopedia. 38,000 was cited for the 2006 edition. That is an increase of 5,000 in 5 years, or 1000 per year. That rate does not include the number of "home churches". You do the math.
Do not allege that there are 33,000 Protestant denominations. This tally comes from the 2001 World Christian Encyclopedia, and it includes all denominations and paradenominations which self-identify as Christian, including Catholics, Orthodox, Protestants, Old Catholics, Mormons, Jehovah's Witnesses, Seventh Day Adventists, Gnostics, Bogomils, etc.
-- from the thread Unsound Sticks, or, Arguments Catholics Shouldn't Use
When this figure first surfaced among Roman Catholic apologists, it started at 20,000 Protestant denominations, grew to 23,000 Protestant denominations, then to 25,000 Protestant denominations. More recently, that figure has been inflated to 28,000, to over 32,000. These days, many Roman Catholic apologists feel content simply to calculate a daily rate of growth (based on their previous adherence to the original benchmark figure of 20,000) that they can then use as a basis for projecting just how many Protestant denominations there were, or will be, in any given year........If the Roman Catholic apologist wants instead to cite 8,196 idiosyncrasies within Protestantism, then he must be willing to compare that figure to at least 2,942 (perhaps upwards of 8,000 these days) idiosyncrasies within Roman Catholicism. In any case, he cannot compare the one ecclesial tradition of Roman Catholicism to 25,000, 8,196, or even twenty-one Protestant denominations; for Barrett places Roman Catholicism (as a single ecclesial tradition) on the same level as Protestantism (as a single ecclesial tradition)....
....In short, Roman Catholic apologists have hurriedly, carelessly—and, as a result, irresponsibly—glanced at Barrett’s work, found a large number (22,189), and arrived at all sorts of absurdities that Barrett never concluded. One can only hope that, upon reading this critique, Roman Catholic apologists will finally put this argument to bed. The more likely scenario, however, is that the death of this argument will come about only when Evangelicals consistently point out this error—and correct it—each time it is raised by a Roman Catholic apologist. Sooner or later they will grow weary of the embarrassment that accompanies citing erroneous figures in a public forum.
-- from the thread 30,000 Protestant Denominations?