Let's take up the definition of the word religious denomination for starters (acc. MW dictionary):
The author of this piece obviously doesn't understand that the Eastern Orthodox Church represents a communion of churches that forms one "legal" and "administrative body," that it is catholic in terms of theology and manner of worship and that Coptic Orthodox is not a "denomination" of Eastern orthodox, or vice versa.
Similarly, the Catholic Church represents a "legal" and "administrative body" of churches, a communion that includes various rites, both eastern and western.
To compare that with various independent, self-styled, self-defined, dime-a-dozen neighborhood buildings called "something church" should be embarrassing enough to not even attempt to so say in public, let alone publish it.
The problem with 30,000 or 8,000 whichever, is that each claims to interpret the "truth" sufficiently differently from the next-door-dime-a-doze-churches to call itself a different "church," reducing the ecclesia to almost a local clanship and personal issue.
What "unites" all Protestants is nothing compare to what separates them, "legally" and "administratively" into separate sects.
My only conclusion about this is that they must NOT have found the truth they claim. For the Truth is One, and minor differences notwithstanding, the true Church will be one theologically, administratively and legally. And there are only two such Churches in the world -- the Eastern orthodox and the Roman Catholic; the two churches that came out of the One original Church.
According to Conservonator that's one too many.