Webthe feature of the imagination to which lewis gave the greatest attention is the use of metaphor or analogy. The heart of christianity is a myth which is also a fact. The old myth of the dying god, without ceasing to be myth, comes down from the. Webif the question of god’s existence becomes firmly implanted in the imagination, it necessarily becomes urgent to the intellect. Unlike many other fantasy writers, lewis. Webin accord with the creed, lewis affirms that the holy trinity is the foundational reality of christian theology. Book 4 of mere christianity (for which the first.