I remember a movie from when I was around jr high. It was about a man who was a preacher and had a brother in a motorcycle gang. The preacher brother joins with a group of teens to help win the biker brother over to Christianity and he becomes a Christian at a high school rally. It seemed like there was a scifi or futuristic feel to it... maybe the teens helping the preacher were part of a team assigned to help. Something like that. I've been trying to find this movie for years. Any ideas?