It’s important to note that the meaning of the word “Gospel” is:
The good news is the message of hope Jesus Christ offers to humanity.
Man was created to fulfill God’s purpose on the earth; yet, he chose to disobey that purpose, resulting in him falling into sin, and sin caused death.
Man was lost. And even with all of the Old Testament practices formed by many people to be forgiven, nothing good reconnected man back to God free from the sting of death.