Christianity was born into a culture that was every bit as resistant and unsympathetic to its claims as ours is. So how did its message come into the lives of people and actually change them?  In Acts, we have more case studies of conversion than anywhere else in the Bible. And in this passage, Luke chooses three to show us both how incredibly different and yet how incredibly similar Christian conversions can be.  What does it mean to be a Christian, and how do you become a Christian? 1) Lydia is a case of the gospel for the religious, 2) the slave girl is a case of the gospel for the oppressed, and 3) the jailer is a case of the gospel for the secular. This sermon was preached by Dr. Timothy Keller at Redeemer Presbyterian Church on November 9, 2003. Series: The Necessity of Belief. Scripture: Acts 16:13-34. Today's podcast is brought to you by Gospel in Life, the site for all sermons, books, study guides and resources from Timothy Keller and Redeemer Presbyterian Church. If you've enjoyed listening to this podcast and would like to support the ongoing efforts of this ministry, you can do so by visiting https://gospelinlife.com/give and making a one-time or recurring donation.