When Jesus sent forth His 12 apostles he gave them instructions NOT to deal with Gentiles:
Matthew 10:5-6 These twelve Jesus sent forth, and commanded them, saying, Go not into the way of the Gentiles, and into any city of the Samaritans enter ye not: But go rather to the lost sheep of the house of Israel.
And during his ministry he spoke with a woman of Canaan (gentile) seeking healing for her daughter telling her he was here for the house of Israel (Jews only).
Matthew 15:24 But he answered and said, I am not sent but unto the lost sheep of the house of Israel.
After the resurrection, His apostles continued only to going to the house of Israel (Jews) only:
Acts 2:36 Therefore let all the house of Israel know assuredly, that God hath made the same Jesus, whom ye have crucified, both Lord and Christ.
Acts 11:19 Now they which were scattered abroad upon the persecution that arose about Stephen travelled as far as Phenice, and Cyprus, and Antioch, preaching the word to none but unto the Jews only.
After Saul’s conversion (and he became Paul) he would go to Jewish synagogues to present Jesus as the messiah, but as they would not receive him he turned to the Gentiles and started the Church.
Acts 13:46 Then Paul and Barnabas waxed bold, and said, It was necessary that the word of God should first have been spoken to you: but seeing ye put it from you, and judge yourselves unworthy of everlasting life, lo, we turn to the Gentiles.
From then on, both Jew and Gentile, to be saved, had to believe in the death, burial and resurrection of the Lord Jesus.
1 Corinthians 15:1-4 Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand; By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain. For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; And that he was buried, and that he rose again the third day according to the scriptures:
Romans 3:22 Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference:
Romans 10:9 That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
Romans 10:12 For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him.
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