I don't know if God wants us to emphasize repentance to the unsaved...could you perhaps clarify a bit more I do not understand this statement.
If you were to tell an unbeliever to repent, turn from your evil ways and trust Christ as your Savior, I believe that it could suggest to the unbeliever that they can get saved by their own works of turning from sin. The quote from McGee goes on to say "emphasize Christ". We are to give the whole gospel of Christ - the holiness of God, man is a sinner and cannot stand before God in heaven, wages of sin is death, the sinless life of Jesus, the fact He paid our sin debt on the cross, His death, burial and resurrection, this is a gift of God - eternal life through Jesus Christ our Lord. When one comes to understand the truth of this message (believe), repentance takes place and by faith one turns to Jesus and cries out to be saved.