What is the theme in Pilgrim at Tinker Creek by Annie Dillard?

A major theme that Dillard explicitly explored is God as lightness or darkness. At times she avoids using the endearment God and simply says “creator.” The book is divided into two halves with “The Flood” serving as the bisector. The first half of the book looks at the wondrous intricacy and abundance in the world. Dillard talks a lot about light and feeling the abundance of God, of feeling divine intelligence in the natural world.