Scriptural FACTS.

1. In Acts 9, Barnabas took Paul to Jerusalem specifically to see if he was on the SAME PAGE as Peter and the rest of the Apostles.

A. (Paul speaking) Acts 20:21 Testifying both to the J'e-ws, and also to the Greeks, repentance toward God, and faith toward our Lord Jesus Christ.

2. Jesus tells the Apostles that "THE Gospel" is to be preached to ALL the world. NOT "the GOSPELS" (plural - more than one). AND Jesus TOLD them to go to "all the world" -(Matthew 28:19). They taught to some of the same Gentiles as Paul did.

A...Mark 13:10 And the gospel must first be published among all nations.

B...Mark 14:9 Verily I say unto you, Wheresoever this gospel shall be preached throughout the whole world, this also thnopehe hath done shall be spoken of for a memorial of her.

C...Mark 16:15 And he said unto them, Go ye into all the world, and preach the gospel to every creature.

D...Luke 4:18 The Spirit of the Lord is upon me, because he hath anointed me to preach the gospel to the poor; he hath sent me to heal the brokenhearted, to preach deliverance to the captives, and recovering of sight to the blind, to set at liberty them that are bruised, 19 To preach the acceptable year of the Lord.

E...Luke 9:6 And they departed, and went through the towns, preaching the gospel, and healing every where.

F. (Jesus speaking) Luke 24:47 And that repentance and remission of sins should be preached in his name among all nations, beginning at Jerusalem.

3. Revelation it's referred to as "the everlasting Gospel".
ONE Gospel - not plural gospels.

Revelation 14:6 And I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people,

4 Jesus main mission was to Israel, but yet He didn't refuse Gentiles. SAME Gospel to the Gentiles as to the Hebrews.

...the Centurian
...the Caananite woman / "bread crumbs from the table"
...the Samaritans