The Old Testament consistently teaches loyalty to the one true God, so what is inconsistent with it is chiefly the worship of other gods, idolatry, and the injustice and unfaithfulness the prophets condemned.
In other words, teachings or practices that turn from the one God, or that ignore justice and mercy, run against the Old Testament’s message.
One God only
A central emphasis in the Old Testament is exclusive loyalty to the one true God. Because of that consistent theme, anything that redirects worship, trust, or allegiance away from that one God is presented as a fundamental break with what the Old Testament teaches.
This includes worship of other gods and any form of religious unfaithfulness that treats the worship of the one God as optional or interchangeable.
No idols
The Old Testament’s first commandments forbid other gods and idols. Taken together, these commandments set boundaries for what counts as faithful worship: the one true God is not to be replaced by other deities, and worship is not to be redirected to idols.
So practices that involve idolatry—giving religious devotion to an idol—are not consistent with the Old Testament’s teaching.
Prophetic rebukes
The prophets repeatedly rebuke three closely related problems: idolatry, injustice, and empty religion. This prophetic theme shows that inconsistency with the Old Testament is not limited to overtly worshiping other gods; it also includes a way of life that contradicts what the prophets called for.
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Idolatry: turning from the one true God to other objects of worship.
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Injustice: conduct that violates what the prophets upheld as right and fair.
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Empty religion: religious practice that lacks the substance the prophets demanded—especially where justice and mercy are ignored.
Because these rebukes are repeated, the Old Testament’s message is presented not only as a matter of whom one worships, but also how one lives in ways consistent with justice and mercy.
Justice and mercy
Alongside loyalty to the one God, the prophetic critiques make clear that injustice and unfaithfulness are out of step with the Old Testament. The prophets condemn “empty religion,” which is religion that continues externally while disregarding what is right—especially justice and mercy.
So teachings or practices that claim to honor God while ignoring justice and mercy are treated by the prophets as inconsistent with the Old Testament’s message.
Frequently Asked Questions
What is the main thing the Old Testament rejects?
It rejects turning from loyalty to the one true God—especially through the worship of other gods and idolatry.
Are idols and other gods treated as a serious issue?
Yes. The Old Testament’s first commandments forbid other gods and idols, and the prophets repeatedly rebuke idolatry.
Is inconsistency only about what people worship?
No. The prophets also rebuke injustice and empty religion, so inconsistency can include living in ways that ignore justice and mercy, even if religious activity continues.
What does “empty religion” mean in this context?
It refers to religious practice that lacks the faithfulness the prophets demanded—particularly when people ignore justice and mercy while continuing outward religious forms.
How do the prophets connect worship and ethics?
By repeatedly rebuking both idolatry and injustice. Their message treats turning from the one God and ignoring justice and mercy as connected ways of being unfaithful.