Well, yes. If you are a mainline, historical Christian, yes, Mormonism is a cult and always has been. BUT, remember that Jews view Christians as a cult, from their perspective. Similarly, Muslims have their divisions--Shiite and Sunni and they view each other that way too. We associate the word "cult" too closely to Jim Jones and other radicals, rather than what it is. Again, from an orthodox, biblical understanding of the Trinitiy, Jesus, the addition of multiple other "sacred" texts (Book of Mormon, Doctrines and Covenants and Pearl of Great Price) the Mormons are most definitely a cult from a Christian perspective.