Yes its all about Salvation, in fact its all the Gospel. Pauls whole Letter to the Romans was premised on the Gospel of God and Jesus Christ, from the very first chapter Rom 1:1,15,16-17
Paul, a servant of Jesus Christ, called to be an apostle, separated unto the gospel of God,
15 So, as much as in me is, I am ready to preach the gospel to you that are at Rome also.
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.
17 For therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith.
Romans 11:32, "For God hath shut up all unto disobedience, that he might have mercy upon all"
The UNIVERSAL OFFER of the Gospel!