Jesus A Cult Leader?

It is very well possible. Let us go through the definition of "cult":

1. a particular system of religious worship, esp. with reference to its rites and ceremonies.   (This, of course, applies to Christianity, especially to Jesus. Christians meet on Sundays to worship their Savior, and communion and baptism are rites and ceremonies. Communion, in particular, is disturbing in that Christians are symbolically eating the flesh and drinking the blood of Jesus, all to "remember" what he did for them. Can anyone say cannibalism?)  
2. an instance of great veneration of a person, ideal, or thing, esp. as manifested by a body of admirers.    (The person here mentioned, is of course, Jesus. Veneration is a feeling of awe, respect, or reverence, which followers of Jesus not only feel, but are commanded to feel.                                                                                                                        
3. the object of such devotion.     (Who is the object? Jesus.)
4. a group or sect bound together by veneration of the same thing, person, ideal, etc.   (Anyone who has ever been to church knows that it is one big community. People band together to help each other, guide each other in their walk with Jesus, and pray. There are study groups, prayer groups, and other types of activities. Through all of this, the church builds itself into a strong community where people go seeking help and guidance with their problems. All of this in the name of Jesus.)

There are other forms of the definition, too, mostly referring to cults involving members living outside of social norms. But even in that particular definition, there was one word that stood out to me: Charismatic. No one can say that Jesus wasn't charismatic. His own people chose him over a hardened criminal to be crucified; that shows a lot about how charismatic he was. And his words have held people for thousands of years, once again showing the power of those words.

For more discussion about Jesus as a cult leader, I recommend this essay:
Cult Leader Jesus

This essay gives a lot more proof positive that Jesus was a cult leader than I have, and even includes Bible passages to make the point. It should be an interesting read for anyone willing to take up the question.