The much-anticipated movie "Unbroken" tells the story Louis Zamperini, an Olympic runner who became a World War II hero after his plane was shot down over the Pacific Ocean.

The film covers Zamperini's brutal internment in a Japanese POW camp, but it doesn't chronicle the years after the war, when Zamperini found Christianity after attending a Billy Graham crusade.

In fact, there is a only brief mention of Zamperini's Christian faith at the very end of the film.

Billy Graham's son, Franklin Graham, the president and CEO of Samaritan's Purse, appeared on "America's Newsroom" today to react to the decision not to feature Zamperini's faith more prominently in the film.

Graham said director Angelina Jolie did an amazing job adapting the book, but she only covered 33 chapters out of 39.

He explained that those final chapters are actually the most important part of the book, when Zamperini was struggling with PTSD, nightmares and alcohol abuse and his wife was about to divorce him.

Graham said that Zamperini was at first reluctant to take the elder Graham's offer to put his faith and trust in Jesus Christ, but he did and was instantly changed, going home that very night and throwing out his alcohol and cigarettes, and instead picking up a Bible.

"His life was transformed instantly that day. And it stayed with him for the rest of his life. He never turned from what he put his faith and trust in, and that was Jesus Christ."

Graham also said that Zamperini's ability to eventually confront the men who tormented him in prison and forgive them is a tremendous story of compassion.

Graham said he's sorry that wasn't included the film, but he encouraged viewers to read the full Louis Zamperini story in the book "Unbroken."

And be sure see the film in theaters, opening Christmas Day.