A quote from "Darwin's Ghost: The Origin of Species Updated" by Steve Jones, 2000, should clear up your argument. Species in scientific definition means separated by the inability to breed. Family has a precise scientific definition which has nothing to do with relatives.
From DG: "Linnaeus--a classifier of what he saw as a fixed biological universe--named the domestic dog as a separate species, Canis familiaris. For him, it had the same status as the elephant or the tiger: an animal so removed from its relatives as to demand a label of its own. The International Commission of Zoological Nomenclature defines its species more stringently. Dogs as an entity were doomed because, once out of its owner's sight, any dog is happy to have sex with any other--even, given the chance, with a wolf....
In 1993 the Smithsonian Institution's "Mammal Species of World", the Who's Who of mamals, admitted the domestic dog only as a subspecies of the wolf Canis lupus. As Canis lupus familiaris it joins the American wold Canis lupus occidentalis and the European wolf, Canis lupus lupus; each so much alike as to be ranked as mere varieties of the same animal." So there you have it:
Genus: Canis; Species: Lupus; Varieties: familiaris, occidentalis and lupus.
Why is Noah a particular problem?
The Bible is full of claims of miracles. Noah is not a particularly hard one to wrap your mind around. There are others--Joshua commanding the sun to stand still, for instance. This is one that bothers a lot of literally-minded--but I've heard more outlandish claims from PhDs in physics. Cats and boxes of bouncing light...?
How about that turning water into wine? Think of the problems, what vintage, what varietal? And the account in John insists that the wine was the best--
Either God is omnipotent or He's not. Either he commands Time or He doesn't. If He is the master of time and space and matter, he can cram a hundread thousand species in a rowboat if He pleases.
Noah is not the problem of faith. The problem of faith is a pediatric oncology ward--there's where you'll find your challenges.