I am sure the movie did reach people in the secular world, but we just don't know it. No matter how much we try and not offend non Christians with the Gospel, there will always be people who will be offended no matter what. The Gospel is like salt, it irritates, it chaps our hide. I believe the Holy Spirit can use anything to convict someone they need to repent of their sin and turn to Jesus, including music and movies. Neither Jesus or the Apostles made the Gospel message "less Christian" to reach people. They preached the Gospel straight up. Some got saved, some rejected it. Our purpose in witnessing to non believers isn't to water down the Gospel to make it more appealing. I believe that can actually lead to false conversions because some parts of the Gospel are skipped in the preaching. Anyways, back to the topic at hand.
As far as the acting, it wasn't top notch. But most all of the actors were voulnteers from the Sherwood Baptist Church in Albany, Georgia, (except Kirk Cameron). You can't really expect them to put on a hollywood style performance. Personally, I think they did a heck of a job. And in most cases, better than Hollywood. Sony must have thought it was good enough because they are distributing the movie along with Facing the Giants and Flywheel, also produced by Sherwood Baptist Church.
To me, I don't really go for how well a person can act. A person can be the best actor in the world and a bad story line would turn me off. With Fireproof, I enjoyed the movie not because of superb acting abilities but because of the amazing faith based story. I do think the actors did an excellent job, but I was taken by the scenes in the movie, so I didn't have time to think about how well the acting was done. But like I said, these are Church members, you can't expect their acting perfomance to match those of trained professional actors.
I actually pefer movies with less acting. Sometimes, acting can be overdone in my opinion. It creates an overdramatic experience that can often seem fake or unrealistic. With Fireproof, the less acting made it seem much more realistic to me. Sure, some parts did seem more like skits, but that didn't really bother me. I was more focused on the story.
I am sure that Sherwood Baptist Church will only get better at making movies. They have gotten better with each movie so far. When God is truly behind something, there will be success. :amen