Evolution, as defined, is a fact.
The theory of natural selection of genetic variation explains that fact.
If you believe that all species that currently exist derived from those few species that could fit on a boat of known dimensions then you accept evolution, speciation and the (semi) common descent of species. Thus your quibble comes down to just how common IS the common descent of species.
What mechanism would you use to explain HOW these modern species came about from those few species that could fit on a boat?
Do you think you don't need an actual explanation for how such things could happen?
What mechanism would you use to explain HOW these modern species came about from those few species that could fit on a boat?
Perhaps a better question is: how does the word "kind" relate to "species"? For instance, would all big cats be considered a "kind" in relation to the Hebrew language used in the Bible? Does "kind" allow for significant variations such that over even short period of time, interbreeding between isolated groups cannot occur? Did these changes in "kind" occur naturally, or by Divine intervention?