For example, in 1909 August Weismann openly noted how his support for natural selection was based not on evidence, but on the necessity of having a naturalistic explanation for evolution. Later, Ronald Fisher accepted natural selection by default on the grounds that alternative explanations were too close to vitalism. More recently, Douglas Futuyma hailed the importance of natural selection for its role in making biology a naturalistic science on a par with physics and chemistry. These are just a few of the many examples I cite in my book The Mystery of Evolutionary Mechanisms. I came to realize that Darwinism developed in order to function as a scientific grand narrative designed to secure the foundation of biology as a naturalistic science, but in more recent times has grown into a philosophical grand narrative designed to naturalize and normalize a fully materialist worldview.
Robert Shedinger, “Confessions of a Liberal Darwinian Skeptic”