I found this story about Quakers on a planet isolated from an Earth they thought destroyed by war for over 100 ago, preachy and boring, never a good combination.
This is a first novel by an author who tends to do preachy but interesting stories.
Fleeing the final war that would destroy Earth's civilization, a small group of Friends--Quakers--found refuge on the uncharted planet they named Foxfield. Somehow they managed to survive, with the aid of the bizarrely gifted native life-form, the Commensals--and, even more extraordinarily, they kept up the practice of their gentle but demanding beliefs. Then, after nearly a century of silence, Earth contacted them--human civilization had miraculously survived the war and had spread out to the stars, flourishing to an undreamed-of richness. And the Friends of Foxfield were a part of it--whether they agreed or not.