Romans:   ALRIGHT!!  But, apart from:

• establishing a solid framework for understanding the gospel;
• discussing humanity's relationship to God;
• establishing the basic concept that all humans have broken God's holy law;
• offering the solution of the atoning sacrifice of Jesus Christ;
• explaining that those who believe in Jesus receive forgiveness for sin and new life in the Holy Spirit;
• examining Israel's place in God's grand scheme of history;
• discussing the future role of the nations in the Kingdom of God; and
• discussing practical applications of redemption in Jesus Christ ...

what has the book of Romans ever done for us?

cf. St. Paul's letter to the Romans.