That's the point, there were no Christians except Eli. Do you think the natural state of man is to exude kindness and morals? Christians are blamed today for the world's ills, they were blamed in Roman days, and I'm sure they will be blamed till Jesus comes. If we attacked Iran today, would the world say we did right or Iran was blameless? It has always been Christians in the way of Satan having his way. It will always be so. The "end" you spoke of was the Bible was the first book printed after they fixed their press, just as the press was invented to print the Bible for the masses.
Your "lens" for observing the movie is set and I think you missed some of the messages sent. I find it remarkable for Hollywood to make such a movie, and you think it was a disaster. It depends on your outlook I suppose. Hollywood will not team up with Billy Graham as a consultant so you takes what you can get. The movie wasn't Biblical, but there are themes that are.
I'm a writer in Hollywood and my late hubby wrote more than one "edgy" movie in his career so I'm not some emotionally fragile, wisp of a girl who faints when "Ragging Bull" comes on. I was just sorry the screenplay was so heavy-handed. It could have been a blessing to a wide audience. And Denzel could have gotten that one made too.