Practical Approach to Christianity - Vol. 2 - My Christian Identity

In a world where true Christianity is being confuse with norms, beliefs, and customs, where do Christians really stands? Matthew 5:14 says, "[We] You are a light of this world. A city on a hill that cannot be hidden." How to serve as light in a world full of darkness? What is my true Identity as a Christian who is a true follower and disciple of Jesus?