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.
This was not always the case. For proof of this:
Matthew 15:22-28
22 And, behold, a woman of Canaan came out of the same coasts, and cried unto him, saying, Have mercy on me, O Lord, [thou] Son of David; my daughter is grievously vexed with a devil.
23 But he answered her not a word. And his disciples came and besought him, saying, Send her away; for she crieth after us.
24 But he answered and said, I am not sent but unto the lost sheep of the house of Israel.
25 Then came she and worshipped him, saying, Lord, help me.
26 But he answered and said, It is not meet to take the children's bread, and to cast [it] to dogs.
27 And she said, Truth, Lord: yet the dogs eat of the crumbs which fall from their masters' table.
28 Then Jesus answered and said unto her, O woman, great [is] thy faith: be it unto thee even as thou wilt. And her daughter was made whole from that very hour.
Gentiles were dogs because:
Ephesians 2:11-13
11 Wherefore remember, that ye [being] in time past Gentiles in the flesh, who are called Uncircumcision by that which is called the Circumcision in the flesh made by hands;
12 That at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world:
13 But now in Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ.
So, the idea that it's only one and the same Gospel throughout, that ignores what anyone can read in scripture, and is shown here and in the OP.
MM