Interesting. Do you know of a good book or source which discusses this? I’d like to know more.
Here's one about the Declaration: https://www.ushistory.org/declaration/lessonplan/slavery.html
Here's one about the Constitution: https://www.ushistory.org/us/15d.asp
I don't have time to look up more. But some good names to learn in the First Great Awakening are Henry Hosier (sometimes called Black Henry), Francis Asbury, John Wesley (who was influenced by the Moravians). Because they were part of the Holiness Movement (Protestants believing that being saved by grace doesn't free us from being called to change our lives and live it like we mean it) was abolition. How can we say we love our fellow man like Jesus said to when we treat some of our fellow men as slaves? To me Black Henry was amazing. The black slaves obviously liked hearing a fellow black man preach against slavery. But they got uncomfortable sometimes when Black Henry would tell them they too should live holy lives or a sinful life might persuade them to ditch Jesus and lose their salvation (obviously making the Calvinists mad too).
For the Second Great Awakening know Theodore Weld ("the most mugged man in America"), the Grimke sisters giving up a wealthy life of slave owners to be abolitionists (one of whom Weld married), and Harriet Beecher Stowe. Weld's book Bible Against Slavery got preachers across America against slavery and was instrumental in getting abolitionist messages from the north into the south around censoring post masters (because nobody dared interfere with ministers communicating with other ministers). If there's a single writing that you want to peg as the most important in building the abolitionist cause, it's that one. This was like a nerd-to-nerd argument against slavery. It details how chattel slavery in his day was worse even than slavery in the Old Testament because the Moses law gave slaves at least some rights. But don't forget his American Slavery As It Is (with help from the Grimke sisters) that was like a personal testimony type book (feel the plight of the slaves with real stories in newspapers of the day from the south, opening the eyes of northerners to how bad the slave experience was in the south). This fueled Stowe's desire to write Uncle Tom's Cabin (fictional, but still impactful).
Weld was physically attacked whenever he gave a speech "down south" -- to him that was in Pennsylvania and Ohio, he didn't dare go further south like Black Henry had done during the First Great Awakening. He formed the Abolitionist Society and they set up a building in Philadelphia across from Independence Hall. Haven't seen the building when you visited Philly? That's because the pro-slavery Dims destroyed the building in Antifa-like fashion right after Weld and his honey got married in it. But he lived to see the Civil War and the 13th Amendment ratified.
I've read in a couple of places that Catholic historians admit that the abolitionist movement was largely a Protestant thing because the Protestants were good at encouraging a personal relationship with God, making the abolitionist movement that went with it a more grassroots type movement than a formal leader movement.