2. Galatians 3:19
What purpose then does the law serve? It was added because of transgressions, till the Seed should come to whom the promise was made; and it was appointed through angels by the hand of a mediator.
Notice the word “added” - means the previous law (Patriarchal law) was not done away – but the Law of Moses was added to what they already were under

3. Ephesians 2:11-12
11 Therefore remember that you, once Gentiles in the flesh--who are called Uncircumcision by what is called the Circumcision made in the flesh by hands--
12 that at that time you 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.

4. Ephesians 2:13-14
13 But now in Christ Jesus you who once were far off have been brought near by the blood of Christ.
14 For He Himself is our peace, who has made both one, and has broken down the middle wall of separation,

5. Ephesians 2:15-16
15 having abolished in His flesh the enmity, that is, the law of commandments contained in ordinances, so as to create in Himself one new man from the two, thus making peace,
16 and that He might reconcile them both to God in one body through the cross, thereby putting to death the enmity.

7. Did the Patriarchal Age end:
Getting Technical
Did the Patriarchal Age end:
When Jesus died on the cross?
When Peter preached on Pentecost? (Acts 2)
When gospel was preached to Samaritans? (Acts 8)
When gospel was preached to Cornelius, a gentile? (Acts 10)

8. Truth Magazine
Meanwhile, God did not abandon the remainder of the world! Contrary to the thinking of some, the Patriarchal Law did not cease with the giving of a special law to the Jews. Rather it continued to serve as the Law of God for all the Gentiles or (non-Jews) till Jesus came and nailed both old Laws to the cross. The Law of Moses continued till Pentecost and the Patriarchal Law continued to Cornelius.
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9. Examples Jethro, father-in-law of Moses
And Jethro, the priest of Midian, Moses' father-in-law, heard of all that God had done for Moses and for Israel His people--that the Lord had brought Israel out of Egypt.
Exodus 18:1

10. Examples Jethro, father-in-law of Moses Balaam, also a Midianite
Then Balaam answered and said to the servants of Balak, "Though Balak were to give me his house full of silver and gold, I could not go beyond the word of the Lord my God, to do less or more.
Numbers 22:18

11. Examples Jethro, father-in-law of Moses Balaam, also a Midianite
Nineveh
So the people of Nineveh believed God, proclaimed a fast, and put on sackcloth, from the greatest to the least of them.
Jonah 3:5

12. Examples Jethro, father-in-law of Moses Balaam, also a Midianite
Nineveh
And should I not pity Nineveh, that great city, in which are more than one hundred and twenty thousand persons who cannot discern between their right hand and their left-- and much livestock?"
Jonah 4:11

13. Truth Magazine
God absolutely did not abandon the entire Gentile world for 1500 years until Jesus came. In Acts 10:2, we learn that Cornelius “feared God” and that he had taught his house do the same. He was devout, he helped the poor, and he was steadfast in prayer. Even though he had a covenant relationship with God, he, like those Jews on Pentecost, needed to hear from Peter what he needed to do!
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14. From this study some facts emerge:
From this study some facts emerge:
Cornelius was not a Jew, therefore a Gentile,
Cornelius was not a Christian prior to Peter’s visit in Acts 10,
Cornelius was lauded by the Spirit as a devout man who worshiped God,
Prior to the conversion of Cornelius the gospel was not intended for them.
We may conclude that for Gentiles, the Patriarchal Age continued until Cornelius and then came to an end.

15. Conclusion
The Jews were in covenant relation with God. However, they needed to hear the gospel of Christ in order to enjoy the remission of sins, membership in the body of Christ, and citizenship in the Kingdom.
It was exactly the same with Cornelius. Though he was in covenant relationship with God, he needed to hear the gospel of Christ. God was granting to the Gentiles “repentance unto life.” Yes, the time had come “. . . in every nation he that feareth him, and worketh righteousness, is accepted with him.”