To put it simply, the Gospel of Jesus Christ is good news. Literally, the word "gospel" means "good news". In the Scriptures we find a declaration of good tidings of great joy that will be for all people - that Jesus Christ has come into the world to save sinners - to deliver His people from sin and death, once and for all.
God is holy and righteous, loving and just, and He has worked about the salvation of His people throughout all of eternity. The question then for each of us (as, if we are truly honest with ourselves, we have all done what is evil; none of us is holy and righteous) is how can we be made right with a holy and just God (who, though He is loving and kind, cannot tolerate sin, lest He cease to be that which He is)?
The answer is that we cannot, we deserve the wrath of God poured out on us for our sin.
The good news of the Bible, is that salvation has come for the guilty and the oppressed and the unrighteous in the man Jesus Christ (Christ: Messiah), the very Son of God. In His life, death, and resurrection, God has worked about salvation for all who would believe in Him / turn from their old ways to Him by faith alone.
You see, since God is loving and just, then He must hate / punish our sin, in the same way that a just judge cannot clear the guilty on the basis of his love for the accused (lest he cease then to be just). The judge, if He is just, must pass the sentence and carry out judgement on the condemned.
Therefore, any salvation or hope of it must come from outside of ourselves (for we cannot spin ourselves the right way round, pick ourselves up from our own bootstraps, or renew our standing with a holy God, as we are the transgressors), it must come from God Himself.
Our standing with God is renewed on the basis of divine grace, on the basis of what Jesus has done for us.
By His life, death, and resurrection, He has borne our griefs and carried our sorrows. He was pierced for our transgressions, crushed for our iniquities, upon Him was the chastisement that brought us peace, and by His wounds we are healed (Isaiah 53).
By faith alone in Jesus Christ, in what He has accomplished on our behalf, by His act of substitution (He takes our place) we can be saved. Though we have no righteousness of our own, by believing in the Lord Jesus Christ, we are justified before God and clothed with His righteousness (Ephesians 2).
Earnestly and honestly consider your life, consider God, consider the Bible, and above all consider what Christ Jesus has done for you; trust in Him by faith today.
Psalm 32 says, "Oh, what joy for those whose disobedience is forgiven, whose sin is put out of sight! Yes, what joy for those whose record the Lord has cleared of guilt, whose lives are lived in complete honesty!"
"But to all who did receive him, who believed in his name, he gave the right to become children of God, who were born, not of blood nor of the will of the flesh nor of the will of man, but of God. (John 1:12-13)