There are not 50,000 Protestant denominations — or any other similar large number thrown out there. From the National Catholic Register:
“I regret to say that is not going to happen here. There are not — repeat with me — there are not 33,000 Protestant denominations. There are not anywhere close to it. It is a myth that has taken hold by force of repetition, and it gets cited and recited by reflex; but it is based on a source that, even Catholics will have to concede, relies on too loose a definition of the word “denomination.””
The primary source for the claim says this about Catholics:
” And then the WCE somehow comes up with 242 Catholic denominations. That should be a big glaring red flag that it has been a bit — how shall we say? — free and loose with the word “denomination.””
Thank you.