To make it even worse, the book goes on to point out that there are (unarguable, in my opinion) similarities between construction of a whale fin and a human hand. Based on this, they conclude that there is no God. Somewhere, between a fact (anatomical similarity) and a conclusion (there is no God) is a leap of logic that I simply could not penetrate.
And here, according to you, is what the book actually said:
Descent with modification is evident in anatomical similarities between species grouped in the same taxonomic category. For example, many of the same skeletal elements make up the forelimbs of humans, cats, whales, bats, and all other mammals, although these appendages have very different functions (figure 22.9). Surely, the best way to build a bat's wing is not also the best way to build whale's flipper. Such anatomical peculiarities make no sense if the structures are uniquely engineered and unrelated."
I have no intention or hope of making you see the point. I merely put the case before the lurkers. I trust them to form their own conclusion. But it is interesting to observe what leaps of logic you are willing to make.