Following the storming of the Capitol this week, I chose to pull out Hoffer's "True Believer: Thoughts on the Nature of Mass Movements." Definitely has a lot of explanatory power, but Hoffer strikes me as a pessimist. It left me with the impression all mass movements, regardless of their ideals, are inherently evil.
Richard Bushman analyzed Joseph Smith's claims of authority as prophet through the lens of Max Weber's concept of political legitimacy. So I went straight to the source and read Politik als Beruf in the original German!
Most accounts of secularization are pretty flat: the march of clear and virtuous reason against the suffocating faith of the Middle Ages. Charles Taylor gives much more detailed account than these over-simplifications-- and regardless of your background, Taylor's work is an engaging read.