During the 1990s, he became increasingly involved in issues relating to evolution, especially because of their growing importance in the intellectual world and the claims by creationists and prominent evolutionists alike that Darwinian science and belief in God are irreconcilable. The American cultural warfare over the teaching of Intelligent Design led Haught to write such books as "God After Darwin, Deeper than Darwin", and "Making Sense of Evolution". These and other works have led to numerous lectures on theology and evolution nationally and internationally. In his works, John Haught argues that an open-minded search for intelligibility requires a plurality of distinct “horizons of inquiry,” allowing for the harmonious cohabitation of science (including evolutionary biology) and religious belief. Haught views science and religion as two different and noncompeting levels of explanation, asserting that "science and religion cannot logically stand in a competitive relationship with each other."