metis
aged ecumenical anthropologist
Actually there's been a lot of changes that have taken place since life forms have been around for close to around 4 billion years.For me, it isn't a god belief that makes me doubt that evolution without a supernatural power is possible. It is TIME. If science has the time since the beginning right, it isn't enough. It is more than 200 years since the start of the controversy and in that time there has been no drastic change in any living thing. It has been about six thousand years since human communications began and there are no accounts of any drastic changes. The fact that so many changes have happened in the time since life began on the Earth, surely there should be something solid to point to. I think @Deeje is right. You have not got it.
The rate of evolution is not the same for all species, so with us humans we tend to evolve much more slowly than mosquitoes or bacteria. Therefore, significant evolutionary changes that might take place in weeks or months with viruses may take millions of years with humans on the same scale. The last significant physical change in humans occurred roughly 20,000 b.p. and it deals with the development of our overbite with our front teeth. But remember, 20,000 years is but a drop in the bucket when compared to millions of years of human evolution.
Nor is evolution "pretty" in that it can be quit haphazard. The concept that Species A will gradually evolve to form Species B is not the model we see. Instead, Species A needs to be viewed as a variety of groups, all evolving in their own way, only some of which may form new species.
BTW, you might want to google "speciation", and even the Wiki article on that is quite decent, plus it provides links to studies.