Darwin's Theory of Natural Selection (Evolution) is an operative principle on how species change over time. For example, let's take the case of pathogenic bacteria and antibiotics.
When antibiotics were developed, people thought they would wipe infectious disease off the map. There was one problem, people did not take the full course of the medicine. The result was: Some of the most resistant specimens of the bacterial growth survived. Repeating this process, a number of times, produced some organisms that could not be killed with the antibiotic.
There is some natural variability in any species, which allows the species to survive new challenges. Variability of the species is not a contradiction to the Creator, it is just a testimonial to the Creator's wisdom.
No argument from me there. Has anything other than reasonable conjecture ever shown it to be natural that one species, in time, became another? How much of the "amoeba to man" story has been confirmed by science?