 The only mention of a church in his Oz books is the porcelain one which the Cowardly Lion breaks in the Dainty China Country in "The Wonderful Wizard of Oz".The Baums sent their older sons to "Ethical Culture Sunday School" in Chicago, which taught morality, not religion.1921's "The Royal Book of Oz" was posthumous attributed to Baum but was entirely the work of Ruth Plumly Thompson.