Romans 10:12 “For there is no difference between the Judaean and the Greek: for the same Lord over all is rich unto all that call upon him.”
Why is that?
There were two types of Jews in the time of Christ. There were Israelites “who heard Him gladly”. Then there were Edomite Jews who argued with Christ and saw to His death. All through the book of Acts the Edomite Jews are referred to in a negative way. The book of Acts is the conversion of Israel to be known as Christians.
The Greeks or in a more broad term used by scripture, Nations, incorrectly “Gentiles”, were those who escaped the Assyrian captivity and had moved to Europe. These were the vast majority of Israelites, who, when they heard the Gospel, converted immediately.
So, no difference between Judaeans and Greeks or Nations is because they had all been, at one time, known as Israelites. One does not graft oranges into an apple tree. The Wild Olives were grafted back into the Olive tree as promised in Hosea and shown in Romans 2, 9 and 11, Ephesians 2 and more.
The story is simple. Edomite/Canaanites are still stealing the inheritance of true Israel. True Israel has been taught they are some Plan B people. True Israel is mostly Christian today. Christ did not fail.