meself, I definitely think that there is a lot of overlap between African & European mythology-and that the reason for this-to a large degree is because one of the main sources for European mythology was African mythology (Egypt/ancient Ethiopia and other ancient cultures). But while I appreciate your comment, I don't want to get sidetracked on that discussion. However, with regards to what some people might read as your point, let me say this:

As far as I know, in neither the traditional Yoruba/Fon religions nor in the Western Hemisphere versions of those traditions (Santeria, Lucumi, Candomble or any others)Legba (Eshu) is notdidn't/don't refer to being possessed by Legba (Eshu) or any other orisa/vodu as "devil possession". As a person learning through reading about traditional African belief systems, it's my understanding that the the concept of and belief in "the devil" in traditional African religions is different than it is in Christianity.

The subject of the religious beliefs of enslaved Africans in the Western Hemisphere is very complicated, and even more so when you include Islam since a significant number of Africans in the Caribbeen, The United States, and in South American were captured from areas in which many people had been Muslim for centuries.
See this brief quote from http://www.barkati.net/english/ The History of Islam:

"As far as Africa is concemed, Islam entered into East Africa at the very beginning of the Islamic period but remained confined to the coast for some time, only the Sudan and Somaliland becoming gradually both Arabized and Islamized. West Africa felt the presence of Islam through North African traders who travelled with their camel caravans south of the Sahara. By the 14th century there were already Muslim sultanates in such areas as Mali, and Timbuctu in West Africa and Harar in East Africa had become seats of Islamic leaming."

-snip-

Given the centuries that Islam has been in West Africa, to fully discuss the religious beliefs of Africans who were enslaved in the Western Hemisphere, one would have to talk about a belief in jinns and other evil spirits. But, as I said, I really prefer not to "go there" (get into that discussion).

I've found a lot of online references to Robert Johnson and selling one's sould to the devil. I'll add a few excerpts from several of those websites in my next post to this thread.