I see that noone has posted on this forum for a while. But I am going to give a response.
I believe a cult is one that believes we obtain eternal life by our works, or the work of the Holy Spirit in the life.
Also a cult does not believe that Jesus came in the flesh. That is, that he was not God in human sinless flesh.
Some cults believe that Jesus came in the flesh, but they believe He had a sinful flesh just like we were born with, which we inherited from Adam and Eve.
They do not believe in the finished work of Jesus on Calvary, but believe they can add to their acceptance with God by their works.
Would anyone like to comment?