The final installment of T3 is on the Early Church and one of the most important points made is on the importance of evangelism – spreading the faith. For many teenagers this is either a foreign concept or utterly terrifying.
To help your students understand the impact of spreading the gospel, you may find the lesson linked below helpful. In it you will find videos of Penn Gillette and a discussion based on them. Penn Gillette (of Penn and Teller) is a proud atheist, but makes an excellent point about authenticity and proselytizing.
The Source 4 Youth Ministry is a great, Christian website that uses media to help make a catechetical point.