Might I suggest "wisdom Jesus" first. I'm reading "the Meaning of Mary Magdalene" now and it's also very good.
I told my kids about him without using any of the xtian rhetoric. I tell them he was a teacher who traveled around with his own quorum so that he could speak in any temple according to Jewish laws of the time.
Then, by definition, they wouldn't be Jews. They may identify with cultural aspects of Judaism but the single thing that separates Jews and Christians is that Christians believe that Jesus was the Messiah.
I am not one to know facts as I agree with alot of what nicolelynn said about Jesus mysticism. I really don't care what facts there are about Jesus being real. I actually teach my kids alot about Jesus visiting among the native americans. There is many traditional stories of a white god coming and I like to tell my kids about Jesus that way.
My perspective: Jesus Christ was more than likely an historical figure. Probably more a rubble rouser than religious figure. He was a rebel that the common people related to. The brilliance if all this is that he was kept alive in stories, parables, paintings. People ate it up. And they continue to do so. My perspective only. Not alleging truth or falsity of the story.