[A.J.Armitage]

World Christian Encyclopedia (2nd Ed., 2001), published by Oxford University Press, lists 33,830 denominations within Christianity. Subtract the Catholic Church and the Eastern churches, and you are left with about 33,800 other churches, those descended from the Protestant Reformation. I rounded down to 30,000 because I thought the resulting comparison with 29,999 was simpler to comprehend. (Say, is that arithmetic abuse?)

And how does it define denomination?

[polemikos]

And how does it define denomination?

In a traditional Protestant way?