Are You There God? It's Me, Margaret by Judy Blume

The book is a coming-of-age story about a sixth-grade girl who is growing up without a religious affiliation, due to her parents' interfaith marriage. The protagonist is in search of a single religion while also confronting typical pre-teen issues such as buying her first bra, having her first period, coping with crushes and the changes that come with growing up. The book explores themes of friendship, religion, love, and self-identity.

The 657th greatest book of all time