In the history of Christendom we see many churches which started of as so called cults or so called heretic movements, though many years later they sometimes outgrew their original group and/or became one of the many main churches. Therefore one should be very careful by damning a group or calling ti a cult or sect, when there is not really anything what qualifies it to become called a sect or cult.
Before calling a church or religious group a "cult" or "sect" one should seriously examine and clarify what one means with those qualifications.
In the first three parts of the Bible (Torah or Law, Prophets and first or Hebrew Writings) the focus is on showing Who is behind everything and What is His Name and Plan or purpose with the universe and mankind. The last three parts (the 2nd or Messianic writings) present with the writings of the apostles (gospels and Acts of the apostles), letters from the apostles and the Revelation of John, the solution God has for mankind and shows the way to God and to the Kingdom of God.