Christian athletes testify to the gospel in competition and beyond. “I believe God made me for a purpose. But he also made me fast,” Eric Liddell wrote in a letter to his sister Jenny before competing as a sprinter for Great Britain in the 1924 Summer Olympics. The 1981 film Chariots of Fire (for my money, the best sports movie ever made) follows the lives of the devoutly Christian Liddell and his Jewish teammate Harold Abrahams at the Paris Games, and actor Ian Charleson, playing Liddell, intones these lines over the film’s sublime final race scene. Liddell wins the gold…