Here's an article about the Yoruba, an indigenous West African religion. It's older than Christianity and Islam. Now it's gaining followers in America.
According to the NPR story, it's gaining followers because "it offers a spiritual path and a deep sense of cultural belonging." It's also popular to African Americans because it "offers them an ancient spiritual heritage, one that pre-dates slavery in the United States."
You can listen to the audio story below and you an also see links to more information about the Yoruba.