Voices of the Martyrs have wonderful, free downloadable booklets on persecuted Christians throughout the world. It includes a little bit about the country, it’s location, culture, dominate religion, and how we can pray for the Christians in that country. These booklets are geared toward children ages 5-13.
VOM also offers a free copy of the book Tortured for Christ, 50th anniversary addition, by Pastor Richard Wurmbrand founder.