I suspect this framing will have greater predictive power than if you take them to either be a natural outgrowth of American low-church Protestantism OR a departure from it in everything but name.

I remember reading a summary of Muslim critique of Fanon: the author (whose name I forget, of whom I only read a summary) took Fanon's claim that socialism must engage and employ each region's culture to succeeed, and used it to deny Fanon's insistence that socialism be anti-religious. ...