I just did a quick look for "Baptists" in Wikipedia and find they say the number is 31 subdivisions. That's a more reasonable number but I still doubt it's really that high; I'd guess maybe 20 is more or less correct. ???
Secular people striving to make Christians look stupid massively exaggerate our divisions by adding everything they can find with that name. Including independent churches which are not by any reasonable judgement a "denomination" and then print their total as an authoritative number. That's how lying sneaks come up with vastly exaggerated Baptist - and all others as well - numbers.
Lloyd Smale said he'd once read that there are some 200,000+ "Protestant" denominations, worldwide. That was some really bad data because the researchers he quoted had determined that all stand alone independent local churches around the world, even home churches, were "denominations" AND if they were not some form of Catholic they were, by that fact, Protestant denominations. That kind of nonsense is worse than a simple error, it's twice over done intellectual fraud!
Truth is, putting a denomination's name on a door does not make it anything. I mean, putting a Chevy Bel-Air name plate and Corvette brake lights on a 4WD Ford Bronco does not make it a Chevy sedan! If a religious people are not operating according to the core doctrines of the named group then they ain't what they claim to be and they lie by claiming to be what they ain't and liars don't make good congregations! (Groups such as "Christian Science", which is neither Christian or science comes to mind.)