I have found the best way to counter covenant or replacement theology adherents is to have them prove their case not only from the NT, but also from the OT. The Bereans only had the OT, and they searched the scriptures daily to confirm what Paul was teaching them. And they were commended for doing so.
"Replacement Theology" replaces the One Seed, with the many seeds in Galatians 3:16.
Jer 31:31 Behold, the days come, saith the LORD, that
I will make a new covenant with the house of Israel, and with the house of Judah:
Jer 31:32 Not according to the covenant that I made with their fathers in the day
that I took them by the hand to bring them out of the land of Egypt; which my covenant they brake, although I was an husband unto them, saith the LORD:
Jer 31:33 But this
shall be the covenant that I will make with the house of Israel; After those days, saith the LORD, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people.
Jer 31:34 And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD: for I will forgive their iniquity, and I will remember their sin no more.
Heb 8:6 But
now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises.
Heb 8:7 For if that first
covenant had been faultless, then should no place have been sought for the second.
Heb 8:8 For finding fault with them, he saith, Behold, the days come, saith the Lord, when
I will make a new covenant with the house of Israel and with the house of Judah:
Heb 8:9 Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they continued not in my covenant, and I regarded them not, saith the Lord.
Heb 8:10 For this
is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people:
Heb 8:11 And they shall not teach every man his neighbour, and every man his brother, saying, Know the Lord: for all shall know me, from the least to the greatest.
Heb 8:12 For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more.
Heb 8:13 In that he saith,
A new covenant, he hath made the first old. Now that which decayeth and waxeth old
is ready to vanish away.
Mat 26:28
For this is My blood of the new covenant, which is shed for many for the remission of sins.
Heb 12:22 But
ye are come unto mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels,
Heb 12:23
To the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect,
Heb 12:24 And
to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than
that of Abel.
Mat 1:1 The book of the generation of
Jesus Christ, the son of David, the son of Abraham.
Gal 3:16 Now to Abraham and his seed were the promises made.
He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.
Rom 9:8 That is, They which are
the children of the flesh, these are not the children of God: but
the children of the promise are counted for the seed.
Mat 21:42 Jesus said to them, "Have you never read in the Scriptures:
'THE STONE WHICH THE BUILDERS REJECTED HAS BECOME THE CHIEF CORNERSTONE. THIS WAS THE LORD'S DOING, AND IT IS MARVELOUS IN OUR EYES' ?
Mat 21:43 "Therefore I say to you,
the kingdom of God will be taken from you and given to a nation bearing the fruits of it.
Pe 2:4 Coming to Him
as to a living stone, rejected indeed by men, but chosen by God
and precious,
1Pe 2:5 you also, as living stones, are being built up a spiritual house, a holy priesthood, to offer up spiritual sacrifices acceptable to God through Jesus Christ.
1Pe 2:6 Therefore it is also contained in the Scripture, "BEHOLD, I LAY IN ZION A CHIEF CORNERSTONE, ELECT, PRECIOUS, AND HE WHO BELIEVES ON HIM WILL BY NO MEANS BE PUT TO SHAME."
1Pe 2:7 Therefore, to you who believe,
He is precious; but to those who are disobedient,
"THE STONE WHICH THE BUILDERS REJECTED HAS BECOME THE CHIEF CORNERSTONE,"
1Pe 2:8 and "A STONE OF STUMBLING AND A ROCK OF OFFENSE." They stumble, being disobedient to the word, to which they also were appointed.
1Pe 2:9
But you are a chosen generation, a royal priesthood,
a holy nation, His own special people, that you may proclaim the praises of Him who called you out of darkness into His marvelous light;
1Pe 2:10
who once were not a people but are now the people of God, who had not obtained mercy but now have obtained mercy.
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