Quote-mining is a common trait among theists. Yes, it is more likely that they'll do so with the words of a scientist or researcher than they will a writer (like Harris). But it's useful to show the context, to make it easier to judge. Harris is, in the quoted portion, being deliberately inflammatory to make a point.
"Well, evolution is a theory. It is also a fact. And facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data. Theories are structures of ideas that explain and interpret facts. Facts don't go away when scientists debate rival theories to explain them. Einstein's theory of gravitation replaced Newton's in this century, but apples didn't suspend themselves in midair, pending the outcome. And humans evolved from ape- like ancestors whether they did so by Darwin's proposed mechanism or by some other yet to be discovered."
-Stephen Jay Gould
-Stephen Jay Gould