You are barely scratching the surface.

Consider Ancient Israel was a monarchy.

Democracy and republicanism originated in pantheistic cultures.

To the Ancients, gods were metaphors, ideals.

Though ideals are not absolutes.

The Christian Trinity went back to fertility rites. The young god, born in the spring to the old sky god and earth mother.

Constantine adopted Christianity for the monotheism, to validate the Empire.

Divine right of kings, as opposed to consent of the governed. The Catholic Church as eschatological basis for European monarchy.

When the West went back to democracy and republicanism, it required separation of church and state, culture and civics.

Just to clarify, the political manipulations go to the foundations of civilization. The winners write the history books and the powerful write everything else. Or at least edit it to fit the script.

Long form;

https://johnbrodixmerrymanjr.medium.com/the-rise-and-fall-of-the-western-mind-906dc73cffe2