"THE" source? I think you are just bloviating to make a point. There are many credible sources for numbers that approximate the 33,000 number that never mention any murders at all. I am accustomed to anti-Catholics, failed Catholics and kooks finding anything they want to on the internet. I'll bet you have a source for rhubarb pie recipes that also slanders the Church.
The main source that amateur RC apologist use is from the World Christian Encyclopedia: A comparative survey of churches and religions in the modern world Second Edition, David B. Barrett, George T. Kurian, Todd M. Johnson Oxford University Press
That laughable number includes Gnostics, Mormons, Jehovah's W's, etc.. Also many thousands of independent churches with identical doctrine are counted seperately.
The same source for this confusion also counts 242 Roman Catholic denominations, which is the number I will be using for future unity discussions.
I see now that you do understand the game and rules.
I think the official term is Discussion Dumb Devolution.
Obviously it is a source used by amateurish Protestant apologists too, but it isn't the source I used. Besides, even if the number were only 10,000, or 1,000 individual sects, schisms, denominations, or what have you, you have a situation in which the only thing that they can collectively agree on or have in common is that they are different from Catholicism. Otherwise the each have their own alter pontiffs or latter day Calvin's redefining, reinterpreting and misrepresenting Scripture, Tradition and their own worldly intentions.