What is the theme in The Praise of Folly by Desiderius Erasmus?

The main argument of The Praise of Folly is that Folly deserves the praise of all. But what does this mean? Folly argues that she deserves the praise of all because she makes many of life's good things possible and brings about happiness to many who could not otherwise have it. She is also worshiped by everyone already and is exalted by many great authorities. Further, she bears important similarities to Christianity, which adds to her status.