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At the end of the 19th century, and at the beginning of the 20th, an anti-clerical and secular movement relies on science and scientific psychology, booming at that time, to fight against beliefs, superstitions and faith, reducing them to psycho-pathological processes. The Faculty of Protestant Theology of Montauban reacts by recruiting research teachers renowned for their interdisciplinary skills, including Franz Leenhardt and then Dr Louis Perrier, a graduate of the Faculty of Science and Medicine of Montpellier, but also of the Faculty of Theology of Montauban. Specialized in obsessive-compulsive disorders, especially religious, he contributed to the development of research on religious feelings, following Henri Bois. He worked for the transfer of the faculty of theology from Montauban to Montpellier. His commitments as a teacher, researcher and doctor were aimed at promoting the scientific approach against obscurantism and fanaticism, he was a pioneer in defending the ecosystemic symbiosis of man in his environment, notably in the Cevenol country. At the end of his career, he seems to be investing more in research applied to education and pedagogy, where nature and its preservation must play an important role in empowering young people to the future of humanity.