“There is a credibility that comes if you are consistent in your behavior, there is a credibility that comes if people see the gospel transforming you.” Tim Keller
Read Tim Keller's most recent book, Kings Cross- the story of the world in the life of Jesus. Amazon
Credibility for Christianity ultimately is Christ Himself. However, as we 'absorb' Christ Himself in the gospel and are transformed by it, our lives will draw people to Christ, even as we speak of Christ, both in word and deed. In this way, we will also have gospel credibility. Keller assists us by walking through the gospel of Mark.