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Romans 5:12 Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:
We all sin and we all die.
Ezekiel 18:4 Behold, all souls are mine; as the soul of the father, so also the soul of the son is mine: the soul that sinneth, it shall die.
Gospel (Greek euaggelion) means literally ‘good message’ and is variously described:
Mark 1:1 The beginning of the gospel of Jesus Christ, the Son of God;
Mark 1:14... Jesus came into Galilee, preaching the gospel of the kingdom of God,
Acts 20:24...so that I might finish my course with joy, and the ministry, which I have received of the Lord Jesus, to testify the gospel of the grace of God.
Romans 1:1 Paul, a servant of Jesus Christ, called to be an apostle, separated unto the gospel of God,
Romans 1:16 For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.
Ephesians 1:13 In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,
The Gospel is the Good news of "The things concerning the Kingdom of God and the name of Jesus Christ” (Acts 8:12) and shows how we can be a part of that wonderful new order which God will establish in the earth when Jesus returns. Jesus himself prayed "Thy Kingdom Come; Thy will be done in earth as it is in heaven.” (Matthew 6:10). God has promised "As surely as I live, all the earth shall be filled with the glory of the LORD” (Numbers 14:21). The Gospel tells us how we be with Christ when he comes in his Father’s Kingdom.
The gospel is the ‘good news’ of the way of escape from death provided for us by God in Jesus Christ. It tells us that God is willing to overlook our sins and freely give to us the righteousness of Christ, if we will believe and obey the gospel.If we believe and obey the gospel we will be raised to eternal life when Jesus returns to the earth.
John 6:40 And this is the will of him that sent me, that every one which seeth the Son, and believeth on him, may have everlasting life: and I will raise him up at the last day.
I hope this helps.