As Dr. Martyn Lloyd-Jones describes in this sermon “The Witnesses,” the Christianity proclaimed in the book of Acts 5:29–32 by the apostles is a Christianity that is grounded in real events. There was a man from Galilee who taught that He was the Son of God and the long-awaited Messiah. He said that He would be crucified for the sins of the world, but that on the third day He would rise from the dead, the result of doing the Father's will. This is the Christianity that the apostles boldly proclaimed to the Jewish leaders following the outpouring of the Holy Spirit at Pentecost. Those who seek to defend the truth of the Christian religion by minimizing or even denying the historicity of its claim do so in complete opposition to the example that the apostles give in the book of Acts. They believed in a true historical Jesus Christ and His bodily resurrection and to deny these historical truths is to reject the Christianity of the apostles, and therefore the true Christianity. The church of today should find hope in a real savior who really lived and died so that sinners could be saved and become children of God. The real life and death of Jesus stand at the heart of the gospel.

http://www.mljtrust.org/sermons/the-witnesses/