A practical argument for evolution includes a theory on abiogenesis. This isn't some scientific discussion limited by parameters.
Evolution doesn't in any way depend on abiogenesis. Even if life was created by some deity at the beginning, evolution (changes of living species over geologic time) still happened.
It is similar to how Kepler knew that planets orbit the sun without knowing the laws of gravity or how planets form. We know that living species change over time (evolution--analogous to planets orbiting the sun). We are figuring out *why* those changes happen (natural selection is a big factor---analogous to the theory of gravity). But how things started is a completely different question (abiogenesis--analogous to how planets form).