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The United States during the first half of the 19th century went through a transformation known as the "Second Great Awakening" (wiki for those who don't know.) It was a massive revival and reformation of protestant religions throughout the US, whose implications are still felt to this day.
The challenge is to completely avoid most of this movement with a PoD after September 17th, 1787. I understand it is basically impossible to avoid some sort of religious revival, but the goal is to make any such revival minor on the grander scale of American society.
Bonus points if movements such as deism and secularism do a lot better. More bonus points if you are able to do all of this while keeping the OTL US borders.