Mark 1:1

Quoted ('the beginning of the gospel of Jesus Christ') to argue that Mark presents himself as recording Jesus' gospel/ Injil, against the Muslim claim that the Gospel of Jesus is something other than the canonical Gospel text.

Cited to argue that the Christian Gospel on hand is the Injil, since Mark explicitly opens with 'the gospel of Jesus Christ' and immediately identifies Jesus as Son of God.

Used to argue that the extant Gospel text explicitly identifies itself as 'the gospel' and thus as the Injil, while also calling Jesus 'the Son of God.'

Quoted ('The beginning of the gospel of Jesus Christ, the Son of God') to press a Muslim caller on whether Mark could count as the Injil, since it explicitly calls itself the gospel of Jesus.

Used by a non-Muslim anti-Trinitarian caller to argue that Jesus is explicitly called 'Son of God' and therefore should not be identified as God himself.