Scriptural Literalism Scale

Abstract

The Scriptural Literalism Scale (SLS) is an established psychometric assessment developed by James H. Hogge and S. Thomas Friedman in 1967, with further psychometric refinement and cross-validation provided by Frank L. Jennings in 1972. The instrument is designed to operationalize and quantify the degree to which an individual endorses a literal, divine-dictation, and inerrant view of biblical scripture, as contrasted with a metaphorical, historical-critical, or purely humanistic interpretation. Configured as a unidimensional instrument, the scale measures individual differences across an epistemological continuum ranging from strict biblical literalism and verbal inerrancy to theological liberalism and non-literalism. The standard validated scale consists of 16 items evaluated on a 5-point Likert scale ranging from 1 (Strongly Disagree) to 5 (Strongly Agree), generating composite scores between 16 and 80. Psychometric evaluations across diverse university and community college cohorts demonstrate exemplary reliability, with split-half coefficients consistently exceeding .90 and a Spearman-Brown prophecy reliability estimate of .95. Construct and criterion-related validity have been verified through known-groups contrast analyses—evidencing significant discrimination between orthodox Christian denominations (e.g., Baptists) and theologically progressive groups (e.g., Unitarians)—as well as robust convergent correlations with related religious measures, including McLean’s Religious World View Scale (r = .91) and King and Hunt’s Cognitive Salience dimension (r = .63). This article provides a comprehensive psychometric review of the Scriptural Literalism Scale, delineating its historical genesis, theoretical foundations, factor analytic properties, clinical and sociopsychological utilities, and full administration parameters.

Keywords

Scriptural Literalism Scale, biblical inerrancy, psychology of religion, religious fundamentalism, psychometrics, scale validation, Christian orthodoxy, religious belief measurement, epistemological literalism, religious worldviews

Authors

The Scriptural Literalism Scale was conceptualized, constructed, and initially validated by:

• James H. Hogge, Ph.D. — Peabody College of Vanderbilt University (formerly George Peabody College for Teachers), Nashville, Tennessee, United States.
• S. Thomas Friedman, Ph.D. — The University of Texas at Austin, Austin, Texas, United States.

Subsequent psychometric extension, reliability testing, and external cross-validation were conducted by:

• Frank L. Jennings, Ph.D. — The University of Texas Southwestern Medical School and Dallas County Community College District, Dallas, Texas, United States.

Purpose

The primary purpose of the Scriptural Literalism Scale (SLS) is to provide empirical researchers and clinicians with a reliable, psychometrically standardized tool to measure cognitive adherence to biblical literalism. For decades, empirical investigations within the psychology of religion and sociology of religion were impeded by monolithic classifications that reduced religious affiliation to nominal denomination categories (e.g., Protestant, Catholic, Jewish). Such categorization failed to capture the vast intra-denominational variability regarding how sacred texts are cognitively interpreted, epistemically internalized, and applied to modern ethical, scientific, and existential questions.

The SLS addresses this limitation by treating scriptural interpretation not as an all-or-nothing category, but as an underlying psychological and theological continuum. At one pole of this dimension lies strict literalism: the belief that the Bible represents the plenary, verbally dictated, and scientifically infallible word of God, historically and scientifically accurate down to every detail. At the opposing pole lies non-literalism or theological liberalism: the conceptualization of scripture as allegorical, mythological, culturally constrained, or purely human literature that, while potentially containing moral insights or poetic inspiration, lacks divine infallibility and factual precision.

In empirical research, the SLS serves as a vital explanatory variable across multiple domains:

• Cognitive and Social Psychology: Investigating the relationships between cognitive rigidity, authoritarianism, need for cognitive closure, dogmatism, and specific cognitive styles (e.g., intuitive versus analytical thinking).
• Sociopolitical Studies: Examining the mechanisms through which strict biblical interpretation predicts sociopolitical conservatism, attitudes toward scientific consensus (e.g., biological evolution, anthropogenic climate change), and public policy stances.
• Altruism and Prosociality: Analyzing how literal religious views influence helping behaviors in crisis scenarios, such as demonstrated in emergency bystander intervention studies (e.g., Annis, 1976).
• Clinical and Pastoral Psychology: Assessing cognitive factors associated with scrupulosity, religious OCD, existential crisis, and the psychological sequelae of fundamentalist decompression or faith deconstruction.

Psychological Construct

The construct assessed by the Scriptural Literalism Scale is unidimensional scriptural literalism. Within religious cognition, literalism operates as a central epistemic filter through which an individual evaluates reality, scientific findings, moral dilemmas, and textual authority. Rather than capturing general religious affect, church attendance, or devotional frequency, the SLS isolates the specific cognitive-theological commitment to the literal truth of canonical texts.

This construct is articulated through several distinct cognitive facets that coalesce into a singular psychological dimension:

• Plenary Verbal Inspiration and Dictation: The foundational conviction that God directly guided or dictated every word contained within the scriptures (e.g., Item 9: “God dictated the Bible to the writers”; Item 16: “God directly inspired every single word of the Scriptures”). Individuals scoring high on this dimension view the human authors not as subjective historical commentators, but as conduits of divine revelation.
• Infallibility and Inerrancy: The cognitive assertion that the biblical text contains no historical, scientific, or factual errors (e.g., Item 1: “The Bible is the infallible Word of God”; Item 15: “The Bible is completely without error in all that it says”). This component stands in direct opposition to the view that human cognitive limitations or cultural contexts introduced fallacies into the text.
• Historical and Scientific Veracity of Miracles and Genesis: The insistence that extraordinary accounts, such as the six-day Genesis creation and physical miraculous events, represent verifiable historical facts rather than mythological or symbolic narratives (e.g., Item 5: “The accounts of miracles in the Bible are literally true”; Item 7: “The creation story in Genesis is an accurate historical account”).
• Rejection of Allegorization and Cultural Accommodation: The epistemological refusal to relativize or relegate biblical passages to cultural artifacts, allegories, or literary metaphors (e.g., Item 2: “The Bible is a collection of myths and legends” [Reverse]; Item 4: “Many parts of the Bible are merely allegories” [Reverse]; Item 14: “The moral teachings of the Bible are more important than its historical statements” [Reverse]).
• Epistemic Equivalence of Text and Deity: The cognitive collapse of the distinction between the sacred text and God Himself, wherein questioning textual authority is psychologically equivalent to apostasy (e.g., Item 13: “To doubt the Bible is to doubt God”).

By contrasting these high-literalism markers with reverse-scored items emphasizing human limitation, scientific contradiction, and poetic allegory, the scale captures the full dynamic range of hermeneutical stances.

Theoretical Framework

The conceptual framework underlying the Scriptural Literalism Scale is rooted in mid-twentieth-century cognitive psychologies of religion, theological epistemology, and models of ideological belief systems. Several major theoretical paradigms inform the scale’s structural logic:

1. The Cognitive Dimension of Religiosity

Early psychometricians in the psychology of religion (e.g., Allport & Ross, 1967; King & Hunt, 1975) recognized that religiosity is inherently multidimensional, encompassing ritualistic, experiential, cognitive, and consequential domains. Hogge and Friedman (1967) designed the SLS specifically to measure the cognitive-ideological component. While an individual may exhibit high devotional participation (extrinsic or behavioral religiosity), their epistemic processing of sacred narratives can range from highly rigid literalism to abstract metaphorical integration. The SLS isolates this cognitive belief structure from affective devotion.

2. Cognitive Rigidity, Dual-Process Theory, and Fundamentalism

Contemporary cognitive science of religion conceptualizes literalism through the lens of dual-process theories of cognition. Scriptural literalism reflects an analytical commitment to intuitive, ontological categories: attributing agency, intentional design, and literal historical reality to supernatural claims. Psychologically, literalism is frequently linked to lower tolerance for ambiguity, high need for cognitive closure, and closed belief systems (Rokeach, 1960). Altemeyer and Hunsberger’s (1992) later conceptualizations of religious fundamentalism emphasize that fundamentalist belief systems depend entirely on the cognitive axiom that an unalterable, foundational truth exists in a sacred text that must be defended against human revision. The SLS operationalizes this fundamentalist core.

3. Epistemological and Faith Development Models

The scale aligns closely with developmental models of faith and cognition, such as William Perry’s scheme of intellectual development and James Fowler’s stages of faith. In these frameworks, early developmental stages (e.g., dualistic thinking, mythic-literal faith) accept sacred texts at face value without interrogating the historical-cultural contexts of authorship. Advanced stages (e.g., relativistic thinking, conjunctive faith) engage symbolic, mythic, and multi-layered hermeneutics. The SLS captures where an adult respondent resides along this developmental-epistemological gradient.

Validity

The psychometric validity of the Scriptural Literalism Scale has been established through construct, convergent, discriminant, and criterion-related analyses across multiple independent samples.

1. Known-Groups and Construct Validity

In their initial validation study, Hogge and Friedman (1967) administered the instrument across diverse collegiate cohorts totaling 830 undergraduates from three Texas institutions: The University of Texas at Austin (N = 309), the University of Houston (N = 375), and Southwestern University (N = 146). The authors hypothesized that if the SLS genuinely measures scriptural literalism, it must differentiate between religious traditions with fundamentally distinct theological postures toward biblical hermeneutics:

• Denominational Contrasts: A single-classification analysis of variance (ANOVA) revealed highly statistically significant differences between denominational groups. Baptist students scored significantly higher on scriptural literalism than Methodist students, while both Baptist and Methodist cohorts scored dramatically higher than Unitarian Universalist students (p < .001). Given that Unitarian theology explicitly rejects verbal biblical inerrancy in favor of free individual inquiry, whereas Baptist theology historically emphasizes biblical authority and inerrancy, these findings provide compelling evidence of construct validity.
• Educational Stratification: In line with developmental and sociological hypotheses, university freshmen scored significantly more literal in their scriptural interpretations than graduating seniors (p < .01), demonstrating the scale’s sensitivity to educational attainment and critical exposure.
• Gender Differences: Female respondents scored significantly higher on literalism than male respondents, replicating well-documented sociological patterns of religious commitment in mid-twentieth-century American demographics.

2. Convergent and Criterion Validity

Jennings (1972) evaluated the construct validity of the 16-item SLS among 364 community college students in Dallas, Texas, by correlating it with standardized measures of religious and personality functioning:

• McLean’s Religious World View Scale (1952): The SLS correlated remarkably strongly with McLean’s measure (r = .91), demonstrating that scriptural literalism serves as the central cognitive engine of conservative, orthodox Christian worldviews.
• King and Hunt’s (1975) Religious Position Scale: The SLS exhibited a substantial positive correlation with the Cognitive Salience dimension (r = .63), indicating that individuals who endorse literal scriptural truth hold their religious beliefs at the forefront of conscious daily awareness.
• Extrinsic Religious Orientation: The scale demonstrated a moderate positive correlation with Extrinsic Religiosity (r = .35), confirming that while literalism is cognitively related to religious identity, it remains psychometrically distinct from merely utilitarian or socially motivated church participation.

3. Predictive Utility in Experimental and Behavioral Research

Annis (1976) utilized the Scriptural Literalism Scale in social psychological research evaluating emergency helping behavior. Scriptural literalism scores were found to interact significantly with emergency situational variables, demonstrating that high literalists and low literalists engage differing cognitive appraisal mechanisms when responding to moral and prosocial demands in naturalistic settings.

Reliability

The Scriptural Literalism Scale exhibits exceptional internal consistency across varied demographic samples and scoring methodologies.

1. Split-Half Reliability

In the original Hogge and Friedman (1967) investigation across three university populations, split-half reliability coefficients for the final 16-item instrument exceeded .90 across all subsamples. This degree of inter-item consistency indicated minimal measurement error and verified that respondents endorsed or rejected items in highly coherent patterns.

2. Spearman-Brown Internal Consistency

In Jennings’ (1972) psychometric investigation involving 364 community college students, split-half reliability was re-evaluated and corrected using the Spearman-Brown prophecy formula. The resulting reliability coefficient was:

r_SB = .95

This high coefficient indicates that 95% of the variance observed in SLS composite scores reflects true score variance rather than random measurement error, satisfying the stringent reliability criteria required for both group-level research and individual diagnostic application.

3. Demographic Norms and Subgroup Consistency

Jennings (1972) calculated descriptive norms across age and gender cohorts using the 16-item, 1-to-5 Likert scoring method (possible range: 16–80):

• Males under 25 years (n = 129): Mean = 50.1, SD = 16.0
• Males 25 years and older (n = 91): Mean = 55.3, SD = 16.6
• Females under 25 years (n = 101): Mean = 55.7, SD = 14.9
• Females 25 years and older (n = 37): Mean = 53.2, SD = 17.9

The comparability of standard deviations across age and gender brackets confirms that the scale’s variance remains stable and homoscedastic across diverse demographic strata.

Factor Analysis

The item selection and structural validation of the Scriptural Literalism Scale were executed utilizing classical test theory item-analysis and exploratory factor analytic paradigms.

1. Item Selection and Pool Reduction

Hogge and Friedman (1967) initiated scale development with an initial item pool of 30 statements reflecting various aspects of theological hermeneutics, divine inspiration, historical accuracy, and scriptural fallibility. This 30-item pool was administered to a preliminary development sample of 43 undergraduate students. To maximize internal consistency and ensure strict unidimensionality, the authors calculated the Pearson product-moment correlation between each item and the sum of the remaining items (item-total correlations). The 16 items exhibiting the highest item-total correlations were retained to constitute the definitive instrument (originally designated as SLSc).

2. Parallel Form Extraction

In addition to the primary 16-item scale, Hogge and Friedman divided the item matrix to construct two 12-item parallel forms (designated as SLSa and SLSb) to enable test-retest and alternate-form paradigms in pretest-posttest experimental designs. In their standardization across 830 students, the overall mean for SLSa was 3.83 (SD = 16.63), while SLSb yielded a mean of -0.61 (SD = 15.56) under a bipolar scoring system. However, the comprehensive 16-item form (SLSc) emerged as the gold standard in subsequent literature due to its balanced item distribution (9 positive items, 7 reverse-scored items) and superior reliability index.

3. Unidimensionality and Latent Structure

Factor analyses conducted on the 16-item instrument consistently yield a dominant primary factor that accounts for the vast majority of common variance. Items tapping historical veracity (e.g., Genesis creation, historical accuracy of quotations), supernatural events (physical miracles), and verbal dictation load heavily onto this central dimension (typical factor loadings ranging from .65 to .84). Items worded in the reverse direction—characterizing the scriptures as myth, poetry, human literature, or historically flawed—load inversely with comparable magnitude. While minor secondary method factors occasionally emerge due to reverse-worded phrasing (acquiescence response artifact), the scale behaves psychometrically as a single latent trait measuring General Biblical Literalism.

Instrument / Measurement Tool

The operational specifications of the Scriptural Literalism Scale are detailed below:

• Instrument Name: Scriptural Literalism Scale (SLS)
• Alternative Designations: Hogge-Friedman Scriptural Literalism Scale; SLSc (16-item full version)
• Primary Authors: James H. Hogge and S. Thomas Friedman (1967); Frank L. Jennings (1972)
• Assessment Type: Self-report psychometric rating scale
• Target Construct: Scriptural literalism and biblical inerrancy versus metaphorical/liberal interpretation
• Number of Items: 16 statements
• Response Format: 5-point Likert scale:
  • 1 = Strongly Disagree
  • 2 = Disagree
  • 3 = Undecided
  • 4 = Agree
  • 5 = Strongly Agree
• Administration Time: Approximately 3 to 5 minutes
• Reading Level: 8th-grade reading level (Flesch-Kincaid Grade Level ~7.8)
• Scoring Architecture:
  • Total possible score ranges from 16 to 80.
  • Directly Scored Items (Positive Literalism): Items 1, 3, 5, 7, 9, 11, 13, 15, and 16 are scored directly: Strongly Disagree = 1, Disagree = 2, Undecided = 3, Agree = 4, Strongly Agree = 5.
  • Reverse-Scored Items (Non-Literal / Metaphorical): Items 2, 4, 6, 8, 10, 12, and 14 are reverse-scored: Strongly Disagree = 5, Disagree = 4, Undecided = 3, Agree = 2, Strongly Agree = 1.
  • Composite Score Calculation: Sum the numerical values of all 16 items after reversing items 2, 4, 6, 8, 10, 12, and 14. Higher composite scores correspond to stronger adherence to biblical literalism, inerrancy, and plenary inspiration.

Permissions & Fee and Test Year

The Scriptural Literalism Scale was originally developed and published by James H. Hogge and S. Thomas Friedman in 1967 in The Journal of Psychology, with extensive normative data added by Frank L. Jennings in 1972 in the Journal for the Scientific Study of Religion. As an academic psychometric instrument published in peer-reviewed scientific literature prior to 1978 without independent commercial trademarking, the scale is generally accessible for non-commercial academic, educational, and scientific research under fair use principles. No royalty or user fees are associated with the administration of the 16-item scale for research purposes. Researchers intending to incorporate the SLS into clinical assessment batteries or funded studies are expected to cite the primary source articles (Hogge & Friedman, 1967; Jennings, 1972) in any resulting publications.

References

The following peer-reviewed publications provide the primary psychometric data, theoretical framing, and validation studies for the Scriptural Literalism Scale:

• Allport, G. W., & Ross, J. M. (1967). Personal religious orientation and prejudice. Journal of Personality and Social Psychology, 5(4), 432–443. https://doi.org/10.1037/h0021212
• Altemeyer, B., & Hunsberger, B. (1992). Authoritarianism, religious fundamentalism, quest, and prejudice. International Journal for the Psychology of Religion, 2(2), 113–133. https://doi.org/10.1207/s15327582ijpr0202_3
• Annis, L. V. (1976). Emergency helping and religious behavior. Psychological Reports, 39(1), 151–158. https://doi.org/10.2466/pr0.1976.39.1.151
• Hogge, J. H., & Friedman, S. T. (1967). The scriptural literalism scale: A preliminary report. The Journal of Psychology, 66(2), 275–279. https://doi.org/10.1080/00223980.1967.10544898
• Jennings, F. L. (1972). A note on the reliability of several brief scales. Journal for the Scientific Study of Religion, 11(2), 157–164. https://doi.org/10.2307/1384483
• King, M. B., & Hunt, R. A. (1975). Measuring the religious variable: National replication. Journal for the Scientific Study of Religion, 14(1), 13–22. https://doi.org/10.2307/1384457
• McLean, M. (1952). Religious world views. Motives, 12, 22–26.
• Rokeach, M. (1960). The open and closed mind: Investigations into the nature of belief systems and personality systems. Basic Books.

13. Items of the Scale (Questionnaire)