Romantic writers had found in Christianity a poetic cult of the imagination, an assertion of the spiritual quality of beauty in an age of vulgar materialism. The decadents, a diverse movement of writers, were the climax and exhaustion of this romantic tradition. In their art, they enacted the romance of faith as a protest against the dreariness of modern life. Ellis Hanson teases out two strands--eroticism and aestheticism--that rendered the decadent...