Other paintings by Delville, such as The God-Man, 1895 (5 meters by 5 meters, Groeninge Museum, Bruges), contrast this bondage [by materialism and Satan, depicted in The Treasures of Satan], with the vision of enlightened, pure souls ascending to heaven. This painting represents the merciful figure of Christ, the great initiate, towering over the bodies of souls striving for union with the divine. The dominant blue color is a symbol of spirituality, just as red is a symbol of materialism and sensualism in The Treasures of Satan. These works are complementary, in that they represent the poles of human destiny. (http://www.bc.edu/bc_org/avp/cas/fnart/art/delville.html)
Various sites date this work to 1900-1903, 1900 or 1895.