JRR Tolkien loved ancient Pagan mythology, especially Norse mythology. He also loved trees, flowers, rivers and streams, mountains, woods, and landscape generally. His writing is infused with a love of Nature, as well as an in-depth knowledge of ancient cultures and mythologies. He was, however, a Catholic, both by upbringing and conviction. He wrote his legendarium as a supporting world for his invented languages; though the earliest version was intended “to restore to the English an epic tradition and present them with a mythology of their own”.
The Inklings and Paganism
Before he became a Christian, C S Lewis was deeply inspired by ancient Pagan mythology, and he continued to value it as mythopoeia after his conversion, and seems to have sought to reconcile the Christian worldview with the ancient Pagan one (for example in That Hideous Strength). Lewis was also fascinated by the symbolism of astrology: a practice and worldview which started in Pagan antiquity and continued well into the Christian era. Lewis’ book, The Discarded Image: An Introduction to Medieval and Renaissance Literature, deals in part with astrological symbolism as part of the medieval worldview.