What is "spiritual naturalism"

n. A worldview that reveres nature, without belief in the supernatural.

Spiritual Naturalism, or Naturalistic Spirituality, is the umbrella term for a variety philosophical and religious worldviews that try to synthesize mundane and spiritual ways of looking at the world. Book searches for the two find no usage for Naturalistic Spirituality before 1956 whereas Spiritual Naturalism may have first been proposed by Joris-Karl Huysmans in 1895 in his book En Route - “In 'En Route' Huysmans started upon the creation of what he called ‘Spiritual Naturalism,’ that is, realism applied to the story of a soul. ...”.

Coming into prominence as a writer during the 1870s, Huysmans quickly established himself among a rising group of writers, the so-called Naturalist school, of whom Émile Zola was the acknowledged head…With Là-bas (1891), a novel which reflected the aesthetics of the spiritualist revival and the contemporary interest in the occult, Huysmans formulated for the first time an aesthetic theory which sought to synthesize the mundane and the transcendent: "spiritual Naturalism".

Long before the term Spiritual Naturalism was coined by Huysmans there is evidence of the value system of Spiritual Naturalism in the Stoics. "Virtue consists in a will that is in agreement with Nature”.