Slippery Slope
Arguing that accepting one position will inevitably lead to a chain of increasingly extreme consequences, without demonstrating that the steps in the chain are actually likely or necessary. Common in theological debates about hermeneutical flexibility.
Source: Classical rhetoric tradition – Public Domain
Also known as: Camel's Nose, Thin End of the Wedge, Domino Effect Fallacy
The slippery slope fallacy asserts that if one step is taken, a chain of increasingly extreme or negative consequences will inevitably follow, without providing evidence that the intermediate steps are actually likely, causally connected, or unavoidable. The fallacy lies not in the observation that changes can have downstream effects — they can — but in the assumption that they inevitably will, without demonstrating the mechanism of causation between each step.
Slippery slope arguments are not always fallacious. Sometimes genuine causal chains can be demonstrated: there is good evidence, for example, that certain incremental legislative changes in specific domains create real precedents with foreseeable consequences. The fallacy version is distinguished by the absence of demonstrated causal linkage between the steps — the chain depends on the feeling that if A happens, B seems natural, then C, then D, even when no necessary connection between the steps exists.
In theological discourse, slippery slope arguments are endemic in debates about hermeneutical flexibility. 'If you allow allegorical readings of Genesis 1, you will eventually allegorize the resurrection.' 'If you accept that Paul's instruction about head coverings was culturally conditioned, you will have no principled basis for treating any of his ethical teaching as binding.' These arguments often express genuine pastoral concern for the integrity of Scripture, but they function as fallacies when they substitute alarm for argument — when the chain from the first step to the catastrophic conclusion is asserted rather than demonstrated.
The Bible itself uses a version of the slippery slope concern legitimately, through the image of leaven: 'A little yeast works through the whole batch of dough' (Galatians 5:9, 1 Corinthians 5:6). Paul's concern is real and the principle is sound — but his usage differs from the fallacy because he is pointing to a specific, identified influence with a demonstrated pattern of spreading effect, not to an imagined chain of hypothetical consequences. The difference is evidence.
- 1An argument proceeds through a chain of 'and then... and then...' steps without demonstrating that each step necessarily follows from the previous one
- 2The catastrophic conclusion at the end of the chain is far removed from the modest first step, and the path between them is assumed rather than argued
- 3The argument's persuasive force comes from the horror of the final consequence, not from evidence that the chain of causation is real
- 4Alternative stopping points along the proposed chain are not considered or are dismissed without argument
- 5The same argument has been used before to resist changes that turned out not to produce the feared consequences
The slippery slope concern is genuinely present in the biblical tradition — the prophetic literature repeatedly warns that apostasy is gradual, beginning with small compromises and ending in total unfaithfulness. Proverbs 4:14-15 warns against entering the path of the wicked, implying that proximity matters. However, these biblical warnings differ from the logical fallacy in that they are grounded in historical observation and specific characterizations of the mechanisms involved. The fallacy version substitutes alarm and imagination for this historical and causal grounding. Additionally, the biblical warnings concern moral and spiritual faithfulness — they are not primarily applied to interpretive methodology, where the same logic has historically been used to resist sound scholarship.
Identify each step in the proposed chain
Ask: What are the specific intermediate steps between the first action and the predicted catastrophe?
Write out the chain explicitly: 'If A, then B, then C, then D, then disaster.' Often the act of making the chain explicit reveals its length and implausibility. 'If we adopt a non-literal reading of Genesis 1, we will adopt a non-literal reading of all historical narrative, then we will adopt a non-literal reading of the resurrection, then we will abandon the faith entirely' is a long chain with several steps that require individual examination.
Examine the evidence for each step in the chain
Ask: Is there historical or logical evidence that A actually tends to lead to B, B to C, and so on?
For each link in the chain, ask: Has this step been observed to occur historically? Is there a logical necessity that makes it unavoidable? Are there examples of people who took the first step without proceeding to the subsequent ones? If many scholars have adopted non-literal readings of Genesis 1 while remaining orthodox in their resurrection belief — and many have — the first link in the chain breaks.
Identify principled stopping points along the chain
Ask: What reasons exist for stopping at the first step rather than proceeding to the catastrophic conclusion?
Most interpretive decisions come with principled reasons that do not automatically extend to other decisions. If someone reads Genesis 1 non-literally because of genre analysis (it has features of ancient Near Eastern cosmological poetry), that genre-based reasoning does not automatically apply to the resurrection accounts in 1 Corinthians 15 (which Paul explicitly frames as historical testimony). The genre analysis principle provides its own stopping point.
Consider the track record of previous slippery slope predictions
Ask: Have similar slope arguments been made historically about changes that turned out not to produce the predicted consequences?
Historical consciousness helps evaluate slope predictions. The same slope argument was made against allowing Bible translation into vernacular languages (if people read for themselves, they'll reach heretical conclusions), against accepting heliocentrism (if the earth moves, Scripture is wrong about everything), and against higher critical methods broadly (if you date texts historically, you'll deny their authority). Many of these predictions did not materialize, suggesting that slope arguments in interpretive theology have a poor historical track record.
Evaluate the legitimate concern behind the slope argument
Ask: What real risk or genuine concern is the slope argument trying to express, and how can that concern be addressed directly rather than through the slope?
Slippery slope arguments often reflect genuine pastoral concern for the integrity of Scripture or doctrinal faithfulness. These concerns are worth taking seriously directly: What specific theological commitments would be threatened by this interpretive change? What safeguards exist against the specific risks the argument identifies? Addressing the real concern directly is more useful than debating the validity of the slope.