Here are some books about angels, the after-life, and other books of a spiritual nature. Note, these are not "religious" books ascribing to a particular religion but are spiritual in nature.
Violet's Vision by Fran Fisher
Robert Reed Publishers
What Goes on Beyond the Pearly Gates: Communication with Angelic Healers by Miriam Bostwick
Why do We All Love Dr. Seuss? Discovering the Mystery and Magic of an Icon by Lois Einhorn