What couldn't the Muslim writer comprehend about the biblical teaching of Jesus?
The Muslim writer could not comprehend that God walked around in the flesh, nor that Jesus arose from the dead bodily and then walked around bodily. These biblical teachings about God in the flesh and the bodily resurrection seemed impossible to him. He questioned how such things could be taught.
Les explains that the same Muslim writer could not comprehend two things: how one can teach that God walked around in the flesh, and how one can teach that Jesus arose from the dead and then walked around bodily. Les notes that the Resurrection is a doctrine that trips up many people, including preachers; some may accept the virgin birth more easily than the bodily resurrection. The only Scriptural time marker for the period from the Resurrection to the Ascension is Acts 1:3, which says Jesus showed Himself alive by many infallible proofs for forty days. Les says the answer to the Muslim's questions is simply, 'Because the Book says it.' He also observes that some men have spent a lifetime trying to prove the Resurrection false.