Half a century ago the time was ripe for a new generalization in science which should include the organic world. Newton had extended the reign of mechanism in space, and Lyell, by substituting the uniformitarian for the catastrophic theory of the formation of the earth's crust, had effected the same extension in time. Men's minds had become familiar with the thought of immense reaches of space and of vast periods of time, and with the idea in both spheres of the reign of natural law instead of immediate divine intervention. The Darwinian hypothesis of Natural Selection came as the culmination of this movement of a progressive substitution of a natural for a supernatural explanation of things. The motions of planets and heavenly bodies, the formation of the strata of the earth's crust, and now the kingdom of organic life were brought within the domain of natural and general law.
It is not necessary to describe in detail the ferment in religious thought which followed the publication of the "Origin of Species," 1859; but we may notice briefly the extreme inferences which were drawn unfavourable to religion, and then the inevitable reaction. On the one hand there were loud claims at first that the death-knell of religion had been sounded. A cause other than creation had been discovered for the origin of species and by analogy for other origins formerly assigned to the Creator. Chance, not only blind but apparently cruel, was enthroned in the place of design in the production of the various forms of life. The higher was evolved from the lower, but in a way that gave to the higher the quality of the lower. Man was no longer the child of God, not even the prodigal child. He was the progeny of the brute and shared his destiny. The obligation to be moral, or even decent, had no higher sanction than the fierce struggle for existence. Theism was derived from animal-or ancestor-worship, and had no higher authority or credibility. Man, no longer made in the divine image, could lay no claim to a divine inheritance; not fallen, but rising out of his brute inheritance, he had no need for the divine mercy.
Renan in France, Haeckel in Germany, and Grant Allen in England agreed that religion was doomed.[51] Religious beliefs, according to the last named, were destined "to be entirely discredited as grotesque, fungoid growths which had clustered around the thread of primitive ancestor-worship." Renan inferred as one result of Darwinism the gradual dying out of religion; while the fundamental postulates of religion, God, Freedom and Immortality, were, according to Haeckel, all given the coup de grace. The life of man, entangled by descent with lower orders of being, seemed divorced from the wisdom and purpose of God, and an all-engulfing mechanism threatened to swallow up the hopes and aspirations of mankind. The situation illustrated the statement of Emerson: "The very hopes of man, the thoughts of his heart, the religion of nations, the manners and morals of mankind, are all at the mercy of a new generalization."
From this extreme position there was an inevitable reaction. Evolution was seen to present a face not so unfavourable to religion. Origin and destiny were two questions; the higher might be evolved from the lower, but not in such a way as to deprive the higher of its proper quality. If nature and man were so closely related, our idea of the worth of nature could be exalted without depriving man of his dignity. "A man's a man for a' that," whether sprung from the dust of the earth, as had been always held, or derived from organic material below him. An orthodox evolutionist developed a new and powerful argument for immortality; if man had gone so far, why not farther? The meaning of the whole evolutionary process, of the long travail of nature, was obviously, if it had a meaning (and why deny this to our intellectual confusion?), the production of man with his endowments, aspirations and hopes. Descent may become ascent, and the meaning of evolution may well be the development of freedom, and immortality but evolution at the end of its journey. A new and grander teleology was discernible in nature, not seen in the details of its products so much as in the great tendencies and lines of its development and the outworking of its laws. Most impressive of all, it was found that devout Christians, like Charles Kingsley, could become evolutionists without losing their faith; and that evolutionists like Romanes (who had spoken, during his eclipse of faith, of the evolutionary theory as a deluge, "uprooting our most cherished hopes, engulfing our most precious creed, and burying our highest life in mindless destruction"[52]) could become Christians, or regain their faith, without affecting their scientific views.
With all the problems which evolution has set for religious thought, it should be noticed that it has distinctly relieved the pressure of one difficulty which has been felt, though now much less acutely than formerly, since the time of Copernicus. In the words of Aubrey De Vere:
This sphere is not God's ocean, but one drop
Showered from its spray. Came God from heaven for that?
Life, and life upon the earth, is the centre of attention in the thought of the day. With the physicist who sees the promise and potency of all terrestrial life in the primitive star-dust, with the biologist who speaks of the fitness of the environment to sustain life, or with the philosopher who sees in the vital impulse the most important thing in the history of the universe, the viewpoint is necessarily biocentric. Yet it has been pointed out that the sum of organized matter "is but an atom in the mass of the solar system, it occupies but a moment in its duration; it has hardly a place in space; it is but a temporary film on one of the smaller planets. It can exist only in a very small part of the scale of temperatures through which the spheres pass from their first to their last state. Set against the visible universe it is as near to nothing as we can well conceive anything to be."[53] A distinguished evolutionist has developed an argument to prove that the earth alone in the solar system or elsewhere fulfills the conditions of the existence of any high form of life.[54] It is not necessary to estimate the value of Wallace's argument in order to emphasize, from an evolutionary point of view, the importance of life and of man in the universe. If the standpoint of science to-day is frankly biocentric, in spite of the insignificant bulk of organized matter, religious thought need not be accused of provincialism because it is anthropocentric in its interest.
In studying a little more closely the religious bearings of evolution, it will be convenient to notice, I. The Method of Evolution, or the biological discussion; II. The Meaning of Evolution, or the philosophical discussion; and III. Theism and Evolution, or the more directly religious aspects of the theory.
I. The Method of Evolution
While there is general agreement among biologists that species have been derived from one another by natural causes, there is a wide diversity of opinion as to the method by which this result has been brought about. Darwin's theory of natural selection has a struggle for existence of its own, a fight for life with other evolutionary theories. Emphatic protests are made from the side of experimental biology (de Vries), of paleontology (Osborn), and of philosophical evolution (Bergson) against the Darwinian hypothesis that the selection of minute fortuitous variations can account for the rise of new species or explain the great lines of development. It is only necessary to read the two volumes published in England and America[55] in honour of the hundredth anniversary of Darwin's birth and the fiftieth anniversary of the publication of the "Origin of Species" to see that scientific opinion upon the question of the method of evolution is widely divided.