I recently had the chance to role play a Mormon for an unsuspecting group of Christians at a church in Southern California. You can watch the encounter below. I'm no longer surprised by how ill-equipped long-time Christians can be, but it still saddens me. However, it also motivates me to get out there and train as many people as I possibly can.
Listen to these Christians engage "Elder Kunkle" and then ask, "How would my church, Sunday school class, small group, youth group, students, etc. do in that situation?" And let it motivate you too.