Luke W. Galen
5 min
For decades, psychological research has often assumed that religion and spirituality (R/S) provide unique, sui generis benefits to mental health and prosocial behavior. This paper argues that this assumption is a "congruence fallacy." By failing to include equivalent secular control conditions, researchers have mistakenly attributed positive outcomes to religious content when they are actually driven by more fundamental, secular psychological processes.
When researchers isolate the variables often conflated with religiosity, the "unique" effect of belief disappears. Three primary secular mechanisms emerge as the true drivers of well-being and prosociality:
Experimental studies that "prime" religious concepts often show increased prosociality, but these effects are replicated when using secular primes (e.g., words related to "court" or "authority"). Similarly, in clinical settings, interventions labeled as "spiritual" (such as prayer or meditation) do not outperform secular alternatives (such as mindfulness or cognitive-behavioral therapy) when the two are dismantled to compare identical components. The paper concludes that the field must adopt more rigorous, "dismantled" research designs that treat secular and religious participants as equals to avoid perpetuating the false narrative that nonreligiosity is a health or moral deficit.
Greater attention to secular and nonreligious individuals has provided much-needed balance as well as alternative interpretations of commonly-held assumptions regarding religiosity/ spirituality (R/S). Contrary to the theory that R/S provides unique benefits in areas such as prosociality and mental health, analogous secular mechanisms exist. The conflation of effects attributed to R/S together with secular effects represents a congruence fallacy. Studies often lack proper controls found in other areas of psychology (e.g., dismantling or placebo designs) that could detect when religion is acting as a proxy for more basic underlying influences. For example, an increased focus on the nonreligious has revealed that religious belief has often been confounded with factors such as strong worldview conviction, social engagement, and normative cultural fit. R/S differences co-occur with demographic, personality, cognitive, and epistemic variables that exert causal influence independent of any religious content. Experimental and treatment outcome studies featuring effects attributed to R/S often have not included equivalent secular conditions or stimuli. The association between spirituality and well-being has been artificially inflated because of conceptual blurring on assessment measures, leading to the miscategorization of some nonreligious individuals into the spirituality domain. In sum, a more specified and critical approach is needed in order to validate assumptions that religiosity and spirituality exert unique effects.
Alex: That's one of the sharper methodological critiques in the review. Many scales blend transcendent and secular items in ways that bake the result into the instrument. You end up measuring something like general well-being and labeling it spirituality—which creates a circular interpretation. The criterion contamination problem is real, and it's underappreciated.
Sam: So the field has been misattributing secular psychological benefits to religious content partly because the measurement tools don't cleanly separate the two.
Alex: Exactly. And the clinical trial literature illustrates this well. When researchers compare religious cognitive behavioral therapy to secular CBT for depression, outcomes are typically equivalent once you control for the therapeutic components. The religious framing is inert. The active ingredient is the cognitive restructuring, not the doctrinal content.
Sam: What about studies that do show a residual religious effect after controlling for the obvious confounds? Are those just sample selection artifacts?
Alex: Often, yes. Many studies exclude nonreligious participants entirely—which means you're only observing how well believers respond to their own preferred language and framing. That tells you nothing about whether religious content is inherently superior to secular alternatives for a general population. You've selected on the moderator.
Sam: So the incremental validity question never actually gets tested properly. [[RP_SECTION:testing-incremental-validity|Testing Incremental Validity]]
Alex: That's the crux. To test incremental validity, you need a secular control condition that's functionally equivalent—same level of social engagement, same cognitive structure, same degree of meaning-making—and then ask whether the religious framing adds anything on top. Most studies don't build that control. They compare a structured, meaningful religious activity to something much weaker, and then attribute the difference to the religious content.
Sam: It's the same error as testing a drug against saline when you should be testing it against an active comparator.
Alex: Precisely. And Galen's prescription follows directly: the field needs experimental designs that dismantle religion into its secular components—social support, habitual practice, shared narrative, self-regulatory commitment—and test whether anything is left over once those are accounted for. If the residual effect size for the specifically religious component is indistinguishable from zero, the uniqueness hypothesis fails.
Sam: So the burden of proof has been in the wrong place. Researchers have been treating religious effects as established and asking secularism to prove equivalence, when the logic should run the other way. [[RP_SECTION:burden-of-proof|Burden of Proof]]
Alex: That's Galen's central point. The null hypothesis should be that religion operates through the same psychological mechanisms as any other meaning-making social institution. The burden falls on researchers to demonstrate residual variance genuinely attributable to religious content—not to a failure of experimental design. Until those controls are in place, the claim of unique religious causation isn't well-supported by the existing literature.
Sam: It's a useful reminder that extraordinary claims about unique mechanisms require extraordinary methodological care—and that the history of a field can sometimes substitute for that care in ways that are hard to notice from the inside.
Alex: Thanks for listening to ResearchPod.