Charles Templeton was surging ahead in ministry. Converted at 21—by 1946 the Canadian evangelist founded Youth for Christ. Billy Graham was hired as the organization’s first full-time evangelist, and he and Templeton toured Europe together. A decade later, after a turn at Princeton Theological Seminary and after wrestling with doubt, Templeton began to identify as agnostic, and his world would never be the same. Colossians 2:8 says, “See to it that no one takes you captive by philosophy...