A crocodile is more closely related to a bird than a lizard. British fishmongers will sometimes substitute dogfish for salmon to unsuspecting customers because they look and taste identical. A salmon, however, is more closely related to a horse than a dogfish.
The two different species of Indonesian leafhoppers that came to the notice of Darwin are morphologically identical. It is difficult for even an experienced observer with an electron microscope, to tell them apart, because the only noticeable difference, is their mating call. They stridulate at different frequencies with different timing and have vocalizations at opposite ends of the vocal scale. In the wild, leafhoppers will only recognise their own mating calls. Darwin argued that they did not interbreed because their territories did not overlap. Intensive farming practices in Indonesia, however, have resulted in the two species sharing a common geographical area. They can be encouraged to interbreed in laboratory conditions when denied access to their own species, yet no hybrid has ever been found in the wild.
We must, then, wonder why human lineage has not speciated. Using Single Nucleotide Polymorphism or what is called the SNP map, it is possible to show that today’s entire human population originated from 50,000 to 100,000 people who lived in Africa 100,000 years ago. On the one hand we have Indonesian leafhoppers morphologically identical and share the same geographical area, evolved into different species that do not interbreed. On the other, our species has exploited the extremes in geographical conditions and climate and the separate regions we populated have produced noticeable differences in morphology - yet only one species. And it is obvious that humans (unlike Indonesian leafhoppers) when first brought into contact from separate geographical areas, are seldom reluctant to interbreed.
It is likely the 50,000 to 100,000 people living in Africa 100,000 years ago from whom we have all descended, are not the same species as modern man. Or to put it another way, if we had one of these individuals alive today, it is likely that we would not be able to produce offspring with him. It is thought they were a by now extinct forerunner of modern man who migrated to the different continents during the ice ages. If so, it is all the more remarkable that an earlier ancestor to our species could evolve on different continents, in vastly different geographical and climatic conditions, producing the same formula for modern man.
Darwinism cannot explain this convergent (or parallel) evolution. Even if the environmental conditions were identical, it is still impossible for a number of separated geographical areas to all hit on the same genetic formula for our species.
This chapter has looked at a number of examples of convergent evolution. God Gametes theory does not claim to know why unrelated species tend to converge on the same trades, the same skills and adopt similarities in external morphologies. Our argument is simply that there is an external life force common to all life on planet earth. Naturally, if all life has a common source, the convergence of unrelated species is possible. The extent to which species have adopted similarity of function and similarity of design would not be possible if the only force driving convergence were the random process of natural selection.

From God Gametes and the Planet of the Butterfly Queen - Conclusion to Chapter 16, page 321