I clearly showed in an earlier post, that the "4000+" number includes divisions which are not churches in any meaningful sense. For example, "tribes' were counted in that number.
Lets stick to what's typical and representative of most of modern man, OK? There simply are not that many truly distinct religions, with millions of adherents each. Many would question calling something like Buddhism a religion, because most Buddhists do not believe in a supreme being. Confucianism is not a religion either, but an ethical system.
Most people who adhere to a theistic belief are either Christian or Muslim. Most Christians agree on major points and differ on minor ones. The church is diverse, because humanity is diverse. The Bible compares the church to a human body, which has different organs for different purposes. Different people want to emphasize different doctrines, or practice different styles of worship, that's all. So the idea that there are myriad Christian churches all differing on what is "truth" is specious, and carries a clear intent to besmirch the church.
So then you disagree with those on these very threads who include "Darwinism" as a religion? It is certainly not a religion.
(You consider Confucianism an ethical system, I consider study of the theory of evolution a science.)