Let us try a different analogy. Biomechanics is a subject closely related, in many ways, to evolution. They will often be discussed together, and they interlink and connect.
Nevertheless, it is possible to study the physical properties of, for example, the counter-current system in the blood-circulation of a dolphins flippers, without reference to evolution. Looking at the matter evolutionarily may help you explain how the system evolved, and may clarify some features of it, but you can demonstrate the mechanism by which the system maintains internal body temperature without talking about evolution. If all of a sudden we realised that creationists were right all along, and God poofed dolphins into existence last week, it wouldn't matter for work done explaining how this system works. A creationist studying it would note the same features.
Similarly, even though abiogenesis and evolution are interrelated, we can study the mechanisms of how a population evolved without reference to abiogenesis. Just as the discovery that God poofed dolphins into existence a few thousand years ago wouldn't change what we know about the mechanics of the dolphin circulatory system, so the discovery that God poofed life into existence 3 thousand million years ago wouldn't change what we know about subsequent evolution.
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