Did the early Jewish believers have to become Christians in order to accept Jesus? What about the Gentiles—did they need to become Jews? These are the types of questions Paul sought to address in his letter to the Romans.
By using Abraham—the paragon of holiness and virtue—as an example of a person who needed to be saved by grace without the deeds of the law, Paul was clear. If it had to be by grace with Abraham, it has to be the same with everyone else.