Recurring to the successive phases of religious thought, the next development of Protestantism, while in a sense world-wide, may be most clearly seen in America. By Jonathan Edwards there was begun the application of a rationalizing process to the theology of Calvin and to experimental religion. In Edwards almost the only result was a more lurid and tremendous affirmation of the old dogma and the old requirement. But the New England mind, speculative, practical, and intense, worked rapidly on. In Channing and his associates came the renunciation of Depravity, Atonement, and the Trinity. In the next generation, Unitarianism expressed itself through Theodore Parker as simple theism. A little later than the Unitarian movement, the old Orthodoxy itself became transformed into a new Orthodoxy. The foremost interpreters of the transformation were Bushnell and Beecher; Bushnell translating the Atonement into terms of purely natural goodness,--not as a transaction, but an expression; and Beecher finding in Christ simply the truth that Love is sovereign of the universe. To Bushnell and Beecher the historical Christ remained in a unique sense an incarnation of God. By later voices of the new Orthodoxy--for example, Phillips Brooks--he is spoken of rather as the one actual instance of perfect humanity, and in this sense a manifestation of God and the spiritual leader of mankind.
But for three centuries men have been studying the facts of existence from an entirely different side from that whence the church takes its outlook. They have been finding out all kinds of curious facts, totally unconnected with any supernatural sphere. First, they made such discoveries as that the world is not flat, but round; not stationary, but doubly revolving. And so they went on. The stars, the plants, the animals, the human body, yielded all manner of curious knowledge. New powers came into men's hands through this knowledge; new avenues to happiness were opened. Facts wove themselves together in wider and wider combinations. Orderly procedure was found where there had seemed such confusion as only capricious spirits could occasion. It is learned, too, that even as the individual man has grown up from babyhood, so the race of man has grown up from the beast. The globe itself has grown from a simple origin into infinite diversity and complexity. There has been a universal, orderly growth,--what we name "Evolution." And it is learned that all mental phenomena, so far as we can explore them, stand in some close relation to a physical basis in the brain, and to a train of physical antecedents.