High SDO strongly correlates with conservative religion, particularly forms like Christian nationalism that endorses hierarchy and in-group dominance. Christian nationalists score 2.5 times higher on SDO than those rejecting it, an effect stronger than partisanship alone, even after adjusting for demographics. Republicans, who score higher on SDO and religiosity than Democrats, often align conservative faith with maintaining social inequalities.

Conservative religious ideologies reinforce SDO by emphasizing authority, tradition, and divine hierarchies, predicting prejudice and status quo policies. High SDO individuals favor religions justifying dominance, blending faith with political conservatism.

See this link for more about Christian Nationalism.