That’s a fair observation at first glance, but it’s somewhat oversimplified. A more nuanced answer is that the New Testament emphasizes “faith” as the engine of obedience, while the Old Testament presents “obedience” as the necessary evidence of covenant relationship—which itself was always meant to be rooted in trust. Here’s a breakdown.
1. The NT focus on “faith” (pistis)
The NT writers, especially Paul, elevate faith as the sole means of justification and the primary human response to God’s grace.
Romans 3:28 – “For we hold that one is justified by faith apart from works of the law.”
Ephesians 2:8-9 – “By grace you have been saved through faith… not a result of works.”
Hebrews 11 – The “faith hall of fame” lauds OT figures not for perfect obedience but for trusting God’s promises before seeing them fulfilled.
Yet NT faith is never mere intellectual assent. It issues in obedience (James 2:17 — “faith without works is dead”). Paul speaks of the “obedience of faith” (Romans 1:5; 16:26). So the NT doesn’t discard obedience; it redefines its source and motive.
2. The OT emphasis on obedience
The OT law (Torah) often seems like pure command: “Do this and you shall live” (Lev 18:5). The covenant at Sinai is conditional on obedience (Exodus 19:5; Deuteronomy 28). Prophets thunder against Israel for ritual observance without moral obedience (Hosea 6:6; Isaiah 1:11–17).
But obedience in the OT was never meant to be mechanical. It was response to prior grace:
God rescues Israel from Egypt before giving the law at Sinai (Exodus 20:2 — “I am the Lord your God, who brought you out… therefore…”).
The Shema (Deuteronomy 6:4–5) commands love for God with all heart, soul, and might — that’s an internal posture of trust and loyalty, not mere external compliance.
Abraham is counted righteous because he “believed the Lord” (Genesis 15:6) — before circumcision or the law. Paul uses exactly this verse in Romans 4 to argue that OT faith, not perfect works, was the pattern.
So the OT already contains a “faith principle”: trust in God’s promises (e.g., Habakkuk 2:4 — “the righteous shall live by his faith,” quoted three times in the NT).
3. The real shift: from theocracy to universality, and from law to Christ
The key difference is how faith and obedience relate to covenant membership.
| OT | NT |
|---|---|
| Covenant nation Israel, with visible law (Torah) | Multi-ethnic church, no Torah as national constitution |
| Obedience to specific commands (Sabbath, food laws, circumcision) marks the community | Faith in Christ’s death/resurrection is the entry requirement; obedience follows as fruit |
| Obedience could be externally enforced (civil penalties) | Obedience is Spirit-driven, internal, and not coerced by the state |
| Faith is present (Psalms, Habakkuk, Abraham) but often implicit | Faith becomes the explicit, exclusive condition for justification |
Thus, it’s not that OT cares only about obedience—God repeatedly condemns empty ritual and demands the heart (Jeremiah 31:31–34). But the form of the covenant required a national law code, so disobedience carried tangible consequences (exile, defeat). The NT, with the new covenant, removes the civil/ceremonial law as a boundary marker, making faith the sole badge of the people of God.
4. Where the “obsession with faith” comes from in the NT
The NT writers were addressing Judaizers who said faith in Christ wasn’t enough—you also need circumcision and Torah observance (Acts 15; Galatians). Paul’s polemic for “faith alone” was a contextual battle cry against adding law-works for salvation. He was not anti-obedience; he was anti meriting favor through law-keeping.
Similarly, the OT prophets had to battle against mere external obedience without faith/love. Their “obsession” was with the heart.
Conclusion
Yes, the NT focuses more relentlessly on faith as the hinge of salvation; the OT focuses more on obedience as the hinge of life in the covenant land. But it would be wrong to say the OT God “only cares about obedience”—He always desired trust (faith) behind the actions. And the NT never praises faith that bypasses obedience; rather, it says true faith produces obedience.
A sharper formulation might be:
OT: Obedience without faith is dead ritual.
NT: Faith without obedience is dead profession.
The difference is which side of the equation gets polemical emphasis in each testament.
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