Since Baptist is a description anyone can claim if they choose, it is meaningless to associate any Baptist church with any other, except on its doctrine, spirit and practice. Westboro Baptist hold destestable doctrines and practices.
Paul's experience with slavery is so far removed from what is our perceived experience (perceived because no one living in the USA has experienced it) that it is not productive to have that conversation without defining terms.
I gladly claim to be purchased by Christ, the spoils if you will, of His victory over my old masters, sin and the devil.
I do believe that everyone who honestly calls on the name of the Lord, understanding who the Lord is and what it means to be saved, will be saved.
Romans 10:9-13