I'd say slave narratives would be a good place to start though the authenticity of some of these narratives (and the degree to which the masters' hands guided some of these narratives) must be questioned. I chopped this from wiki
From the 1770s to the 1820s, the slave narratives generally gave an account of a spiritual journey leading to Christian redemption. The authors usually characterized themselves as Africans rather than slaves.
Dr. Claud Anderson in the following video talks about religion being a controlling device for black people in slavery days in his PowerNomics speech. I never listened to the complete video so I don't know how far he goes into the religion aspect but it may be a little help.
Ase'!!! Dr. Claude is great. Also, Dr John Henrik Clark. I will inbox you some things later.