Vodun was actively suppressed during colonial times.
"Many Priests were either killed or imprisoned, and their shrines destroyed, because of the threat they posed to Euro-Christian/Muslim dominion. This forced some of the Dahomeans to form Vodou Orders and to create underground societies, in order to continue the veneration of their ancestors, and the worship of their powerful gods."
The Affaire de Bizoton of 1864. The murder and alleged canibalization of her body by eight voodoo devotees caused a scandal worldwide and was taken as proof of the evil nature of voodoo even though the confessions that condemned the accused were obtained illegally by torture.
Vodou has often been associated in popular culture with Satanism, witchcraft, zombies and “voodoo dolls”. Zombie creation has been referenced within rural Haitian culture,but is not a part of Vodou. Such manifestations fall under the auspices of the bokor or sorcerer, rather than the priest of the Loa. The practice of sticking pins in voodoo dolls has history in folk magic. “Voodoo dolls” are often associated with New Orleans Voodoo and Hoodoo as well the magical devices of the poppet and the nkisi or bocio of West and Central Africa.
The general fear of Vodou in the US can be traced back to the End of the Haitian Revolution (1791). There is a legend that Haitians were able to beat the French during the Haitian Revolution because their Vodou deities made them invincible. The US, seeing the tremendous potential Vodou had for rallying its followers and inciting them to action, feared the events at Bois-Caiman could spill over onto American soil. Fearing an uprising in opposition to the US occupation of Haiti, political and religious elites, along with Hollywood and the film industry, sought to trivialize the practice of Vodou. After the Haitian Revolution many Haitians fled as refugees to New Orleans. Free and enslaved Haitians who moved to New Orleans brought their religious beliefs with them and reinvigorated the Voodoo practices that were already present in the city. Eventually, Voodoo in New Orleans became hidden and the magical components were left present in the public sphere. This created what is called hoodoo in the southern part of the United States. Because hoodoo is folk magic, Voodoo and Afro-diasporic religions in the U.S. became synonymous with fraud. This is one origin of the stereotype that Haitian Vodou, New Orleans Voodoo, and hoodoo are all tricks used to make money off of the gullible. 
The elites preferred to view it as folklore in an attempt to render it relatively harmless as a curiosity that might continue to inspire music and dance.”
Hollywood often depicts Vodou as evil and having ties to Satanic practices in movies such as The Skeleton Key, “The Devil’s Advocate”, The Blair Witch Project, The Serpent and the Rainbow, Child’s Play, Live and Let Die, and in children’s movies like The Princess and the Frog.
In 2010, following the 7.0 earthquake that devastated Haiti, negative attention to Vodou also followed. One of the more notable examples would be of televangelist Pat Robertson’s televised discourse on the subject. Robertson stated that the country had cursed itself after the events at Bois-Caiman because he claimed they had engaged in Satanic practices in the ceremony preceding the Haitian Revolution. “They were under the heel of the French, you know Napoleon the third and whatever. And they got together and swore a pact to the devil. They said ‘We will serve you if you will get us free from the prince.’ True story. And so the devil said, ‘Ok it’s a deal.’ And they kicked the French out. The Haitians revolted and got something themselves free. But ever since they have been cursed by one thing after another”.