I've got a couple of things you might be interested in. There's the Atlantic World of Anthony Benezet. He's kind of the OG of protestant abolitionism in the Americas. It's a collection edited by Marie-Jeane Rossignol and Bertrand Ruymbeke.

https://www.goodreads.com/book/show/31110792-the-atlantic-world-of-anthony-benezet-1713-1784

There was a good interview with Luke Harlow on the New Books network about his book on religion and abolitionism and slavery in Kentucky. He claims Kentucky is great to examine the issues b/c it was a microcosm of everything else going on in the US at the time. https://newbooksnetwork.com/luke-e-harlow-religion-race-and-the-making-of-confederate-kentucky-1830-1880-cambridge-up-2014-4

PBS has an episode of Africans in America on Lemuel Haynes which is also worth checking out. I might also look for stuff on Richard Allen and Absalom Jones.