Do people that use voodoo believe in there own god?

Practitioners of Vodun (the real name for "Voodoo") worship the same God as Christians, Muslims, and Jews. They just believe different things about Him/Her.

They believe in lesser gods whose standing is somewhat similar to Angels, called Orishas or Vodun. The Word "vodun" means "the spirits" or "the spirits of nature". The Vodun embody the various forces of nature.

Practitioners of Vodun and related faiths in Africa and the diaspora believe that God is truly infinite, unfathomable, and all-powerful. They understand that mere mortal humans cannot possibly relate to Him/Her. So instead of asking Him/Her to override the forces of nature (which would be a blasphemous implication that He/She makes mistakes), they approach the forces of nature to help them to solve problems or just to show thankfulness for blessings or lessons learned.

In Haitian Voudou, a type of Vodun practiced in the diaspora, the lesser gods are called loa. They use the images and attributes of Catholic saints to represent them. The integration of Catholic saint Image in Voudou goes back to the colonial period. The whites forbade the slaves to practice their ancestral faiths and the Catholic religion was imposed on them. So in order to serve the spirits and not get caught by their masters, they integrated Catholic saints' images into the religion to show the masters that they were praying to the saints that they were required to, when in fact, deep inside their hearts ,they were praying to the gods they really belived in.

They are not small gods rather big gods