J. Michael Finley

Bart Millard

Madeline Carroll

Shannon

Dennis Quaid

Arthur

Trace Adkins

Brickell

Cloris Leachman

Memaw

Jason Burkey

Mike

Mark Furze

Nathan

Randy McDowell

Jim

Cole Marcus

Robbie

Alexander Dominguez

Kent

Brody Rose

Young Bart

Taegen Burns

Young Shannon

J.R. Cacia

Rusty

Tanya Clarke

Adele

Nicole DuPort

Amy Grant

Jake B. Miller

Michael W. Smith

Priscilla C. Shirer

Mrs. Fincher

Gianna Simone

Dr. Avondale

Joshua Walsh

Ross

Mark Robert Ellis

Coach

Samuel Sadovnik

Young Kent

Christopher Augustus Mathews

High School Student

Erick Ashlock

Jock

Kerry McCormick

Nurse

David Norona

Bill Layton

Kevin Downes

Singleton

Rhoda Griffis

Jen

Bill 'Bubba' Bussey Jr.

Radio DJ #2

Delilah Rene

Delilah

Ed Spinelli

Coach (uncredited)

Brenda Williams

Concert Attender (uncredited)