Years ago, when I began pastoring, I faced an unexpected problem. Each Sunday, after preaching to my small congregation, I would go home wondering if my sermons were true. What if Christianity was just a grand hoax? What if it was all a myth? These doubts drove me to study apologetics, from the Greek apologia, meaning defense. Paul used this word in 2 Timothy 4:16 and Philippians 1:7,16. Peter wrote, "Always be prepared to give an answer [emphasis added] to everyone who asks you to give the reason for the hope that you have" (1 Pet. 3:15). I found apologetic...