I could have sworn that when I saw this on television circa 1980 or 1981, the film ended with a snake dancer being bitten mid-routine, and continuing to dance as the fatal venom took its course, all to a very haunting song. It definitely featured a cult, a snake dancer, a midget, an ending in a cave, and was produced in the seventies. Has anyone seen an alternate version of this that includes such an ending?
There are two versions of this film. The complete version (called Island of the Snake People "Snake People", or Muerte Viviente), and a slightly edited one (called Cult of the Dead), where they removed a few non-essential scenes. The endings are otherwise identical.
I think many "voodoo" movies use the same themes: snake dancing with drums, cults, zombies, etc. Usually these take place on some exotic island, with a suggestion of a Haitian connection...
I am intrigued that there was a voodoo movie including a cave and a midget! If you can recall anything else about this movie, I would like to know about it.
I can either assume that my five-year-old mind misinterpreted the information I was seeing, or else there really is another film with that many similar ingredients. As you say, its a shoe-in to have snake dancers and tropical islands when dealing with voodoo themes, but an ending in a cave and a midget make what I remember a very peculiar concoction. I'll keep looking, with the idea that I may be remembering incorrectly.