(I don't care about your religious views I just want you to think about something.)
What if he was? The Bible states that he has performed some pretty unusual miracles. Perhaps he had just discovered a few different ways of doing things. Such as thinking of a new way to distribute food, creating healing remedies, and being very charismatic. He could have been ahead of his time in terms of creative thinking and scientific advancements.
These achievements, unexplainable by other people at the time, may have been seen as godlike and the people raised him to the status of a prophet. Do you think that this is a possible scenario for the creation of the New Testament?
Who knows perhaps Scientology will be the dominant religion in 3000 years and L. Ron Hubbard the messiah.