According to Constantin Gutberlet writing in "Catholic Encyclopedia" (1911), "materialism", defined as "a philosophical system which regards matter as the only reality in the world…denies the existence of God and the soul." In this view, materialism could be perceived incompatible with world religions that ascribe existence to immaterial objects. Materialism may be conflated with atheism; according to Friedrich A. Lange (1892), "Diderot has not always in the Encyclopædia expressed his own individual opinion, but it is just as true that at its commencement he had not yet got as far as Atheism and Materialism."