Was Jesus just a great moral teacher?

I am studying various religions in my theology class at school and have been hit with the fact that every single religion that believes in Christ (except for Christianity) just believes that he was a good teacher, not the Son of God (John 1:1).  

What do we say to this?  Read the quote below and tell me what you think.

"A man who was merely a man and said the sort of things Jesus 

said would not be a great moral teacher. He would either be a 

lunatic - on the level with a man who says he is a poached egg - or 

he would be the devil of hell. You must take your choice. Either this 

was, and is, the Son of God, or else a madman or something worse. 

You can shut Him up for a fool or you can fall at His feet and call 

Him Lord and God. But let us not come with any patronizing 

nonsense about His being a great human teacher. He has not left 

that open to us. He did not intend to". 

 -- CS Lewis