This is an inaccurate quote--but it is used often enough to claim something it does not actually say that it made The Quote Mine Project: Or, Lies, Damned Lies and Quote Mines.
Here is the documentation (about 2/3 of the way down the page).
I checked your reference. It appears that the Church of Darwin have gotten their panties in a twist over a single sentence. Ok, I’ll add it here. Here’s the quote with the additional sentence:
“Our theory of evolution has become . . . one which cannot be refuted by any possible observations. It is thus “outside of empirical science,” but not necessarily false. No one can think of ways in which to test it. . . . (Evolutionary ideas) have become part of an evolutionary dogma accepted by most of us as part of our training. The cure seems to us not to be a discarding of the modern synthesis of evolutionary theory, but more skepticism about many of its tenets” (Ehrlich and Birch, p. 352).
Sounds to me like they are lamenting the fact that Darwinism has become dogma and made them a laughingstock among scientists (and now laymen) who know better. LOL!