Analogy seems to favour the opinion that as, like other systems, Christianity has arisen and augmented, so like them it will decay and perish; that as violence, darkness, and deceit, not reasoning and persuasion, have procured its admission among mankind, so, when enthusiasm has subsided, and time, that infallible Controverter of false opinions, has involved its pretended evidences in the darkness of antiquity, it will become obsolete; that Milton's poem alone will give permanency to the remembrance of its absurdities; and that men will laugh as heartily at grace, faith, redemption, and original sin, as they now do at the metamorphoses of Jupiter, the miracles of Romish saints, the efficacy of witchcraft, and the appearance of departed spirits.
"The Complete Poetical Works of Percy Bysshe Shelley Volume III"
Percy Bysshe Shelley Edited by Thomas Hutchinson, M. A.