It is absolutely mandatory that you have some sort of plan for exiting, especially in a large church sanctuary that seats hundreds of people. Get down low. Crawl in such a way that you have cover and concealment. You'll probably get to where you're going safely. If you are in a church classroom, one of the best avenues of escape is a window.
Room dividers are actually better, safer, than having a solid core wall.
You can get from room to room simply by dropping the handle and walking through to the next room, which is where your exit might be. Don't hide in closets, they can be a death trap.