If someone should ask you to give them the gospel, then just say:
BELIEVE ON THE LORD JESUS CHRIST AND YOU WILL BE SAVED.
(Acts 16:31).
This is when time is greatly limited and you want to give the clerk a quick gospel.
Most people in America is very familiar with Jesus, and know who Jesus is, but, they have never believed for themselves on Jesus. So, this single sentence can make them aware that they need to believe it for them. Actually, Jesus gave this very same easy and simple Gospel Himself.
(John 1:12) Jesus said: whosoever believes on me, will be called a child of God, and for those that even believe on my Name.