I am saying that the salvation of Christ includes gentiles. I am also saying this includes gentiles:You say that Hebrews 9:15 also includes Gentiles.
We agree Gentiles werent under the first testament only Israel. Look at the verse again.............[Hebrews 9:15 KJV] "And for this cause he is the mediator of the new testament, that by means of death, for the redemption of the transgressions [that were] under the first testament, they which are called might receive the promise of eternal inheritance."..........Jesus died to redeem the transgressions that WERE UNDER THE FIRST TESTAMENT, If the Gentiles werent under the new testament they couldnt have any transgressions to redeem. Only Israel had transgressions committed under the first testament.
Jesus came to redeem Israel to be a blessing in the millennial kingdom and to be priests to lead the Gentiles to the Lord and be saved. Now we know that the blood shed only for the sins of Israel was also applied to us, Jew and Gentile. We only know this because Christ revealed it thru Paul
Ro 10:8-11
But what saith it? The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach; 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.For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.For the scripture saith, Whosoever believeth on him shall not be ashamed.