Fundamentalism is largely a religious manifestation of right-wing authoritarianism.

Evidence

Fundamentalism can therefore usually be viewed as a religious manifestation of right-wing authoritarianism. It correlates better with RWA scores than any other religious variable I know of, certainly better than Christian Orthodoxy does. … But religious fundamentalists, as we have defined and measured the term, provide way more than their “fair share” of the right-wing authoritarians, and the most prejudiced people in our society. — Bob Altemeyer, The Authoritarian Specter, 2135 (#expands, via linked claim)

The correlations with religious variables reinforced previous findings. Right-wing authoritarians tended to come from strong religious backgrounds (.45), and they were quite inclined toward religious fundamentalism (.71). But the same comparisons for Social Dominance Orientation equaled . and .18. — John T. Jost and Jim Sidanius, Political Psychology, 987 (#corroborates, via linked claim)

It should be noted that many religious people score moderate or low on the RWA Scale, not high. These respondents tend not to be fundamentalist. They seem more seeking, more including, less dogmatic-our next topic, save one. — Bob Altemeyer, The Authoritarian Specter, 2195 (#complicates, via linked claim)

Categorization

• XREF: connects to: Right-wing authoritarianism predicts racial prejudice but religious fundamentalism does not once controls are applied. — Wade C. Rowatt and Lewis M. Franklin, Christian Orthodoxy, Religious…, 24; The Religious Right includes more than fundamentalists — Randall Balmer, Bad Faith: Race and the Rise of the…, 36; Authoritarianism correlates with orthodox religious belief in every religion studied. (+5 more)

Broader Connections

• Fundamentalism operates as religion expressed through authoritarian personality #expands (0.95) — Bob Altemeyer, The Authoritarian Specter, 2135
• Religious fundamentalism correlates strongly with right-wing authoritarianism but barely with social dominance. #corroborates (0.92) — John T. Jost and Jim Sidanius, Political Psychology, 987
• Many religious people score low on authoritarianism and are non-fundamentalist #complicates (0.78) — Bob Altemeyer, The Authoritarian Specter, 2195
• Authoritarianism can manifest on the political left as well as right #complicates (0.72) — Leonard S. Newman and Ralph Erber (eds.), Understanding Genocide, 446