Is this the mindset of "Jesus wasn't necessarily the Son of God, he was a really nice guy who had good ideas"?
I'm paraphrasing here, but C.S. Lewis once said that if Jesus Christ were not in fact the risen Lord, then he was surely a crackpot.
In other words, it would be impossible, by His own words and deeds, to ever be construed as merely "a wise man". He must be taken as either the Savior or a nutcase--no safe middle ground.
Lewis talked about this in some depth in "Mere Christianity".