The gospel does address those issues. But my great and primary need, if any of my human relationships are to be changed, is first of all that I be changed toward God. Repentance toward God. Faith is trust, reliance, commitment unto Jesus Christ. It is spiritual union to Jesus Christ.
Faith is confidence in the risen Savior.
Faith toward our Lord Jesus Christ - that is the object of our faith. It is faith in our Lord Jesus Christ. Those words bring to us all that the Bible tells us of the Son of God, the Savior, the Lord, the one who is the Lord of glory, who has humbled Himself even unto death for our sins. We must have this gospel testified to us by the faithful preaching of the gospel. We must hear that faithful gospel preached to us on the Lord's day.