Bahai Faith: One of many cults?

The Bahai Faith group is one of many cults. Why does it fall under this category? After all there are buildings for those in this particular religion to gather in. So, why is it called a cult anyways? What is so bad about it?
Well, the Bahai Faith group says "All roads lead to heaven,or simply put, all paths get us to God anyways. One is not better than the other. No one can say that one way, path, or road is better to travel because they all lead us to the samething God and the ulimate end Heaven." This quote is from a person who told me this, and afterwards said that they believed it was rude and inconsiderate of others to say otherwise. They even went so far as to say that anyone who disagreed with them would go to hell.
Yet the Bible teaches us something completely different. It teaches us that there is only one "way" to heaven. John 14:6 "Jesus said...I am the way, the truth and the life, no man cometh unto the Father, but by me." Jesus was saying that no one can come to Father, God the Father, except through him. Plus, the Bible teaches us in Proverbs 15:14 that "There is a way that seemeth right unto a man, but in the end thereof it leadeth unto death." The people teaches us that man's way is not God's way. That man in and of themselves can not possibly accheieve heaven. What a contrast to what the Bahaia Faith and other cults teach!