The Gospel is the whole counsel of God, his word, and there is way more to it than what you are saying here.
That is the gospel in a nutshell. The gospel is not the entire Bible. Not everything written in God's word is a part of the gospel. Before the cross, the content of the gospel that Paul taught and came to him
through a revelation of Jesus Christ (Galatians 1:11-12) was still a
mystery. The gospel is a message of grace that is to be received through faith. The gospel is not a set of rituals to perform, a code of laws to be obeyed or a check list of good works to accomplish as a prerequisite for salvation.
Ephesians 3:1 - For this reason I, Paul, the prisoner of Christ Jesus for you Gentiles 2 if indeed you have heard of the
dispensation of the grace of God which was given to me for you, 3 how that
by revelation He made known to me the mystery (as I have briefly written already, 4 by which, when you read,
you may understand my knowledge in the mystery of Christ), 5
which in other ages was not made known to the sons of men, as it has now been revealed by the Spirit to His holy apostles and prophets: 6 that
the Gentiles should be fellow heirs, of the same body, and partakers of His promise in Christ through the gospel, 7 of which I became a minister according to the
gift of the grace of God given to me by the effective working of His power. 8 To me, who am less than the least of all the saints, this grace was given, that I should preach among the Gentiles the unsearchable riches of Christ, 9 and to make all see what is the
fellowship of the mystery, which from the beginning of the ages has been hidden in God who created all things through Jesus Christ.
In this age, there is a distinctive element to the content of the gospel which is called "the mystery of the gospel" (see Ephesians 6:19 and compare with Colossians 1:26-27; 4:3). This new revelation is that the
Gentiles are fellow-heirs and fellow-members of the body, and fellow-partakers of the promise (Ephesians 3:6). Such equality, Jew and Gentile united together in one body was previously unknown. The distinctive message of the church is that Jew and Gentile alike may believe the gospel and be united together into one body. (Ephesians 1:13; 1 Corinthians 12:13)