ARE GENTILES INCLUDED IN THE THREE PROMISES OF THE ABRAHAMIC COVEN ANT WITH MANY ?.......

The third covenant promise God made to Abraham in God's covenant with Abraham is according to:

Genesis 12:3

".....and in thee ( Abraham ) shall ALL FAMILIES OF THE EARTH BE BLESSED."

AND AGAIN: 

Genesis 18:18

"Seeing that Abraham shall surely become a great and mighty nation ( Israel ),  and ALL THE NATIONS OF THE EARTH SHALL B E BLESSED IN  HIM."

The definition of the word "confirm"  means : 'to complete', or 'to fulfill', or 'to deliver' on a promise already made in the following Scripture :

Daniel 9:27

"And He shall confirm the covenant WITH  MANY...."  ( ie. With the many nations of the earth. )

 Jesus Christ shall confirm the third promise blessing of the Abrahamic Covenant WITH MANY  nations of the earth.  God confirmed the third promise blessing of the Abrahamic Covenant according to :

John 3:16

" For God so loved the world that He gave His only begotten Son that whosoever believes in Him should not perish, but have everlasting life."

SO, THERE YOU HAVE IT:

Galatians 3:16-17 ( Paul is the Apostle to the Gentiles )

"Now to Abraham and his seed were the promises made,  and to his seeds as OF MANY , but as OF ONE , and to thy seed which is Christ."

Galatians 3:29

"And if ye be Christ's,  THEN YOU ARE ABRAHAM 'S SEED , and HEIRS ACCORDING TO THE PROMISE."  ( ie. The third promise of the Abrahamic Covenant with many.)

According to Your Holy  Word WITH  MANY ,  come Lord Jesus !