I'm a christian and would love a 'darwin' fish as I think they are totally not mutually exclusive!!! Why cant God have created the world through evolution?
Because it kind of misinterprets what is meant by evolution in the context of origin of species and life on Earth.
The literal meaning of evolution is change thru various small steps. My house has evolved. When I moved in, it looks nothing like it does now. Over a period of time I've altered it. But I always had a plan about how I wanted it to look.
But one of the corner stones of biological evolution is that it is unplanned. That is fundamental to evolutionary science.
So if god started evolution, he did it in the same way as they guy who invented and made the lottery draw wheel. He made it, but has no control over what results it would throw up. So god started of evolution as a way of kicking off life on earth, but he had no idea of how it would turn out. The advent of humans came as a total surprise to him. That doesn't sound much like any god I've heard about.
If we're saying that god is all knowing, and kicked off evolution knowing that millions of years later we would end up with humanity, then you're welcome to believe that, but that isn't evolution as we understand it.
If you say you believe in the theory of evolution as put forward by Darwin and updated with new evidence in the 150 years since, then you believe evolution is an unplanned and random process.
If you think god is overseeing how evolution proceeds, and knows what life will be like in a million years time, and always knew we'd have humans and rhinos and oak trees and grasshoppers, then you don't believe in Darwinian evolution at all.