Covenant Theology: One Promise, One People, One Christ

The Bible is one book telling one story — a promise made to Abraham, unfolding through history, and fulfilled beyond all expectation in Jesus Christ.

One Covenant Story Running Through the Whole Bible

This is not a story that starts in Matthew. The covenant God made with Abraham in Genesis 12 — 'I will make of you a great nation... and in you all the families of the earth shall be blessed' — is the spine of the entire Bible. ^[4] God did not issue that promise and move on. He returned to Abraham repeatedly, each time developing and specifying what he had pledged. ^[4] And what began as a call to one man in one place was always aimed at something universal: 'all the families of the earth.' ^[5]

The Statement of Faith puts it plainly: 'Throughout salvation history, God by his Word and Spirit has been calling sinful people out of the whole human race to create a new redeemed humanity.' ^[SF] That is exactly what you see when you trace the Abrahamic covenant forward — God is not managing a nation-state. He is building a people. And the whole Old Testament is the scaffolding going up around that project. ^[SF]

The True Children of Abraham Are Those Who Share His Faith

Here is where the New Testament surprises people — and where this pulpit has been direct about clearing up category confusion. One group has Abraham's genes. The other has Abraham's faith. And what you see in the New Testament is that 'Abraham's descendants are those who have his faith, not his genes.' ^[9] Paul drives this home in Galatians 3:29: 'If you are Christ's, then you are Abraham's offspring, heirs according to the promise.' ^[9]

Genesis 15:6 is the key that unlocks all of it: 'Abraham believed the Lord and it was counted to Abraham as righteousness.' ^[4] That counting — that crediting of faith as righteousness — is the same transaction that happens when anyone trusts Christ. As Paul writes in Romans 9:6-8, 'not all who are descended from Israel belong to Israel... it is not the children of the flesh who are the children of God, but the children of the promise who are counted as offspring.' ^[4][5] The blessing of Abraham isn't just material blessing. 'The blessing of Abraham is the Spirit, and the blessing of the Spirit comes through the penal substitutionary death of Jesus.' ^[10]

And so, as this pulpit has stated plainly: 'It is not inappropriate to say the church is the true Israel. The church has replaced Israel as the people of God, the inheritors of covenant blessing.' ^[8] That is not a demotion of Abraham — it is the fulfillment of everything God promised him.

The Old Covenant Was Real — But It Was Never the End

The old covenant had glory — actual glory. When Moses descended from Sinai, the Israelites couldn't even look at his face. But Paul's point in 2 Corinthians 3 is that it was 'a glory which was being brought to an end.' ^[6][12] The old covenant was not a mistake. It was a ministry — but 'the ministry of condemnation.' The new covenant is the ministry of righteousness, and 'the ministry of righteousness must far exceed it in glory.' ^[6][12]

The Hebrews writer makes the same case: 'the old covenant was lacking. It was insufficient. It didn't do everything that was needed to save a sinner. And we needed a new and better covenant, and that covenant is through Christ.' ^[7] The old covenant established relationship with God, but it was 'dependent upon ceremony, sacrifice, and works.' ^[1] The new covenant blessings 'just blow away the old covenant.' ^[1] Think of it this way: the first wine at the wedding was real wine — but the wine Jesus made was better by an order of magnitude. ^[1]

The Statement of Faith captures the relationship precisely: the new covenant church stands 'in continuity with the old covenant people of God but now brought to fulfillment by the work of Christ. Through all the institutions and offices of the Old Testament, the Spirit's work pointed to the ultimate revelation of God through his Son.' ^[SF] The old covenant was never the destination. It was always a finger pointing forward.

The Cross Is Where the Promise Gets Paid

A promise made all the way back in Genesis 12 was fulfilled when Jesus offered himself as a payment for those whom God would save. ^[9] That is the headline of the whole covenantal story. Jesus becomes a curse — bearing the full weight of the law's condemnation — 'so that Abraham might become a blessing to the Gentiles, namely, so that we might receive the promised Spirit through faith.' ^[10]

The reason God can relate to us 'like a father to a son is found in the cross, because He crucifies His own Son.' ^[10] The cross is not a detour in the covenant story. It is the address the story was always heading toward. And the second Adam — where the first Adam failed as the representative head of the human race — 'Christ's sinless life of wholehearted obedience obtained the gift of perfect righteousness and eternal life for all of God's elect.' ^[SF] Faith 'cleaves us to all the blessings that flow from Abraham, blessings that continually get more detailed as Scripture unfolds.' ^[10]

God Has Been Keeping His Word to Abraham All Along — Right Now

Here is something that should arrest your imagination. When God said to Moses, 'I am the God of Abraham, Isaac, and Jacob' — not *was*, present tense — those three men were already in God's presence. ^[9][13] God was not eulogizing them. He was keeping his word to them in real time. As Jesus himself says in John 8:56, 'Abraham rejoiced that he would see my day. He saw it and was glad.' ^[3][9]

Think about what that means. Every time God gathers another lost sheep from east or west — every time someone trusts Christ and is counted as a child of Abraham — 'he looked over at Abraham and said, you have another son. My promise in Genesis 12 is true.' ^[3][9] Abraham is watching the fulfillment of promises made to him from a banquet seat, and he is glad. This idea that 'God is still fulfilling his promises to Abraham and is kind of nodding to Abraham in the fulfillment of those promises' — that is not a peripheral detail. That is the shape of how God works. He makes promises. He keeps them. Forever. ^[3]

The heroes of Hebrews 11 'though commended through their faith, did not receive what was promised, since God had provided something better for us, that apart from us they should not be made perfect.' ^[2] They didn't see everything. But they will. 'They will reach the promised land of God's glory. They will worship with their children in the eternal city. They will know the crucified and risen Christ.' ^[13] God's covenant faithfulness is not bounded by a single lifetime — or even a single age of history.

What This Means for You

If you are in Christ, you are Abraham's offspring — heirs according to the promise. ^[9] Not because of your bloodline. Not because of your ceremony. Because you have the same faith Abraham had, and God counts that faith as righteousness. ^[4][8] The veil that lies over the old covenant 'when they read the old covenant... is only through Christ that it is taken away. When one turns to the Lord, the veil is removed.' ^[6][12]

And the sign of the new covenant is not a mountain that 'was smoking and trembling' approached by a people who 'could not draw near to God.' ^[7] The sign of the new covenant is the Spirit poured out — poured on you — because Jesus absorbed the curse and sent the blessing. ^[10] 'With the giving of the Spirit at Pentecost, God's people were reconstituted as his new covenant church.' ^[SF] You are standing inside a promise that was being built for millennia before you arrived. Stand in it accordingly.

This page synthesizes what Chris Oswald has preached on covenant theology at Providence Community Church. Every claim above traces to the cited sermons — follow any citation to read the full sermon, listen to the audio, and see the surrounding context. Minute marks are approximate, estimated from each sermon's transcript.