Unashamed of the Gospel Romans 1:15-17
15That is why I am so eager to preach the gospel also to you who are in Rome. 16
I am not ashamed of the gospel, because it is the power of God for salvation to everyone who believes, first to the Jew, then to the Greek. 17For the gospel reveals the righteousness of God that comes by faith from start to finish, just as it is written: “The righteous will live by faith.”…
Actually Rome received the gospel after the Jew and the Greek. Greek and Roman two different things. Christ's church was first established among His Jewish kinsmen, then the Greek, Rome was third. The Canon existed before Rome put together a version of the bible for the Western world . It is very useful but is not the only source of Canon (Authority) in the world. That authority is scripture btw not the men who compiled it. All men are subject to the Word....put from pen to paper. There have been some great Holy men of Rome as well though.
Concerning the OT the Ethiopians received that before the Greek or Roman by it being gifted to Queen Sheba (Along with a child),
And then also the NT gospels. The Ethiopians imho have the complete Canon(Authority) through scripture in their possession. And since the Ethiopian Jews are just that an extension of the Jewish nation through Solomon and Sheba they too would have received the NT gospels before the Greek and Romans. First to the JEW, then the Greek then the Roman.