Well, this is not an easy question, as it's hard to say what " practically noone" means.
In Cote D'Ivore, most people are either Muslim or Christian, so it's definitely true that most people are not practicing traditional religions.
However, an estimated 3-10 percent of the population still practices traditional religions and some fuse elements of traditional religions with Christianity or Islam.
So I would judge the statement as "false" that "practically noone" - since some people do!
