The gospel is the power of God for salvation–not just for getting saved, but it is the power for being saved, and the power for our salvation that is yet to come.
Salvation is for the believer, and the power of God for salvation is the gospel.
Simple Truth: The gospel is for believers.
*Correction: I reference 1 Corinthians 1:15…that verse is actually 1 Corinthians 1:18. Thanks to Jim for listening and catching this!