Evolution is a foundation for many aspects of biology. In my own field, medicine, recognition of evolution of bacteria, viruses, and parasites means people looking for more effective antibiotics.
If one doesn’t recognize evolution, taxonomy classifications seem meaningless. One can go on and on, but evolution is considered one of the four or five foundations of biology. (Cell theory and genetics theory are two others.)
Nonsense. You can classify organisms just as easily under the assumptions that God created similarities between them.
And Creation theory doesn't reject the idea of change within species in response to environmental pressures, either, so there is no argument there.
Just what discovery wouldn't have been possible while observing biological processes with the mindset of "let's discover how God created this structure or system"?