Someone wisely suggested that personal testimony is really the key in sharing one's faith. What happened to me in my own life? How is it different since I put my trust in Christ? A true before-and-after distinction illustrates the gospel very effectively.

Even young people who have known the Lord for as long as they can remember, since earliest childhood, can point to a time when they had misplaced their faith in a person, or a behavior, or adherence to a set of rules, or some religious formula - and how repentance from that and faith towards God brought them deliverance and/or peace and strength.

My request of these two young people was for details - not so much of their own testimony (because both sets of parents have witnessed these kids' professions of faith in Christ) - but of what salvation is; what one is saved from, and how that is or was accomplished, and by Whom.

The rest is easy to communicate to another, when testifying of it's application in one's own life.