Steve Saint's explanation says it all:
In an e-mail to Christianity Today Movies, Saint said, "I could not imagine how something like this could slip through a professional screening process." He continued, "After I got over the emotional shock of realizing that a man who has chosen to live a lifestyle in stark contrast to my dad's would actually be playing his role in End of the Spear, I realized I would likely be held responsible for that decision. I wanted the issue to go away. Finally, I realized I was going to have to face what was happening, and there was little chance of coming out unscathed."
"This is one of the most extraordinary stories of love and forgiveness that I've ever known," Allen said. "But I also realized the incredible responsibility of playing these two men, especially as I learned more about how important Nate Saint and Steve Saint are to people around the world. I really felt the weight of that."
Allen didn't meet Steve Saint until about three months after he was hired, when shooting began in January 2004 in Panama. When they finally met, Allen says he told Saint, "If you don't want me to do this movie, because I respect you and your family so much and I respect this story so much, I will walk away from this—contract or no contract, even if that means I'm liable for breaking the contract."
But Saint had already decided to keep Allen on board. He said he had been praying about it, and that God clearly revealed the answer in a dream.
In the dream, Saint says he was "being chased by a mob of Christians who were angry with me for having desecrated 'their story.' The answer to their hostility was easy: Just ask Chad to remove himself. But as quickly as this thought came to me, I found myself standing before God. His look was not as compassionate as I had expected. God said, 'Steve, you of all people should know that I love all of my children. With regard to Chad Allen, I went to great lengths to orchestrate an opportunity for him to see what it would be like for him to walk the trail that I marked for him. Why did you mess with my plans for him?'
"I was fully awake by the end of this sleepy mind play. I knew that there would be a price to pay for any position I would take on this issue, regardless of the fact that I had not wanted to be involved. I knew one thing for sure: I would rather face the anger and even hatred of people who feel I have let them down, than to take any chance of having to stand before my Savior and have to answer for messing up his plans for Chad."