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Charles Darwin, Francis Galton and Ernst Haekel each, in their own way, connived to supplant God's supremacy with a vision of man as master of his destiny. Together, they were the progenitors of the eugenics movement and the galaxy of evils unleashed in the 20th century. Darwin's book, The Descent of Man was the inspiration for Galton's founding of the Eugenics Education Society which advocated, among other things, the creation of a database of the elite of England which would be encouraged to breed early and often, and the supression of society's "inferiors" through sterilization and internment. Not content, he began promoting the vainglorious theory that nature herself destined the superior (i.e. Anglosaxon) race to dispatch the dark continent's inhabitants into evolutionary oblivion.
From this, Ernst Haekel, at Germany's University of Jena, took the torch of the Eugenics agenda with the zeal of a preacher. He wrote two popular books in which Monism, a kind of religious natural philosophy, emerged. His book, Wonders of Life, ridiculed and undermined every aspect of Christianity's body and spririt dualism, and with reptilian coldness, he stated that society was no place for the biologically unfit. The charity of the Church and care of medical science were intrinsically destructive to society. These men, more than any other figures, provided the "science" that allowed the Nazis to justify Aktion T-4, their eugenics program, and later, the camps and final solution. The reverberations of Monism follow us today with our own farrago of death dealers (Jack Kevorkian, Margaret Sanger and Derek Humphrey... ad infinitum).
Galton was one of the founders of the secular humanist horde presently darkening our horizon. Without the grace of God, the mind and imagination darken and the will becomes pernicious and destructive. In their negation of the one thing that could given them wisdom, how could Galton, Darwin or Haekel hope to profess what was good and noble for mankind?