I created this slider to use with the Birth of John lesson. Depending on your students, you can make these before class and use them during the lesson like I do, or you can let them put the slider together. But, in either case, I would use the craft knife before class to cut the sides open. The students enjoy these and I have them slide to each visual as I teach the lesson.
You can see instructions to assemble this slider, the lesson, visuals, worksheets and more @ Bible Fun For Kids