The gospel is for all.
Paul turned to the gentiles here.
Acts 13:46 (LEB) — 46 Both Paul and Barnabas spoke boldly and said, “It was necessary that the word of God be spoken first to you, since you reject it and do not consider yourselves worthy of eternal life! Behold, we are turning to the Gentiles!
Having been commanded by God
Acts 13:47 (LEB) — 47 For so the Lord has commanded us: ‘I have appointed you to be a light for the Gentiles, that you would bring salvation to the end of the earth.’
and salvation (eternal life) achieved for the gentiles as well
Acts 11:18 (LEB) — 18 And when they heard these things, they became silent and praised God, saying, “Then God has granted the repentance leading to life to the Gentiles also!”
Acts 13:48 (LEB) — 48 And when the Gentiles heard this, they began to rejoice and to glorify the word of the Lord. And all those who were designated for eternal life believed.
If Jesus wanted to save non-Hebrew Gentiles, He would have prayed for them right before going to the cross:
9 I pray for them: I pray not for the world, but for them which thou hast given me; for they are thine. John 17:8–9.
In John 17 above Jesus as High Priest does two things which the high priest does always under the Law, that is, pray for the people of God in covenant, and offer sacrifices for the people of God in covenant. Jesus, as High Priest, does neither in John 17 in a prayer Martin Luther calls the "Holy of Holies" Prayer.
If you read John 17 Jesus makes a distinction between "the world" and "Them" (the children of Israel, including the 12 disciples.
From the cross Jesus completes His Ministry as High Priest before He is slain and says, "Father, forgive THEM for they know not what they do."
"Them" and "THEY" in John 17 are identified as the disciples, and those who will believe through their testimony. But before that, Jesus sanctifies Himself right before the cross exactly doing what the high priest under the Law is commanded by God to do.
Besides this, Saul, as rabbi and Pharisee says:
4 But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law,
5
To redeem them that were under the law, that we might receive the adoption of sons. Galatians 4:4–5.
In both passages if God wanted to atone for the sins of non-Hebrew Gentiles they would be under the Law which for centuries before Jesus the high priest ministered before God and prayed and offered sacrifices for the children of Israel - and Gentiles.
BUT nowhere does the high priest leave Israel, go to the Gentiles that surround Israel, and offer sacrifices for them and that's because Gentiles are not under the Law nor are they included in the sacrificial system of atonement instructed and commanded by God.
Gentiles are NOT atoned by Christ.