Cast of Are You There God? It's Me, Margaret.

Rachel McAdams portrays Barbara Simon, one of Margaret's friends, in 'Are You There God? It's Me, Margaret.'

Abby Ryder Fortson plays the lead role of Margaret Simon, a young girl on the cusp of adolescence, in the film.

Kathy Bates brings Sylvia Simon, Margaret's grandmother, to life with her remarkable acting skills.

Elle Graham portrays Nancy Wheeler, Margaret's classmate and friend, adding depth to the character.

Benny Safdie plays the role of Herbert Simon, Margaret's older brother, in the movie.

Amari Alexis Price brings Janie Loomis, Margaret's classmate, to the screen with her engaging performance.

Katherine Mallen Kupferer portrays Gretchen Potter, another one of Margaret's friends, in the film.

Kate MacCluggage plays the role of Mrs. Jan Wheeler, Margaret's mother, in 'Are You There God? It's Me, Margaret.'