Yeah vodun is definitely a fon/ewe tradition.
Iirc yoruba people have a very distinct religion with various dieties , although most modern day yoruba people are christians.
Anyway, I think people see how poor Haiti is and how dark skinned most of the people are and they automatically assume that they are closer to african culture than most blacks in the west but like you said that's not true when you look deeper into the culture.
Yep, I think that is the reason too. Like I said genetically that may be the case.
I do think haitians as a whole have retained more 'african culture' than most of the other carribean islands.
I personally think Afro-Cubans would give them a run for their money in that department.
Heck Cubans STILL speak in Yoruba when they do their Orisha dances/prayers. I think Haiti may come second in the Caribbean.