I feel many try to skip the latter
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:
Clearly says Gentiles were not part of the old covenant, we alien to Israel and strangers from the covenant. Gentiles never had any part of the old covenant and it was done away with.
15 Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace;
this means he removed ALL of the old covenant not part like the sda'ers want us to believe but ALL. its gone it died when Christ died. God did not write the 10comandments to the gentiles nor did he make a covenant with the gentiles before he came to earth born of a woman.
we Gentiles are under the new Covenant which has most everything the old had but not all.
Jesus is at peace with having removed the complete old covenant and so can we be at peace.