American Chattel Slavery Might Be Uniquely Cruel in World History

This does not seem to be true. A quick Wikipedia check confirms he was a slave owner and owned 3 plantations, but the part about deliberate evangelization for control and its widespread adoption I cannot find anywhere.

Also, this is not even a book, as is evident by reading the cover. The actual book is to be found here: https://docsouth.unc.edu/church/jones/summary.html

Christianity also was used by African Americans for their own emancipation, see for example the AME, and many slave owners opposed its spread along slaves This is of course not in support of Christianity or slavery, but the issue isn't this simple.