I'm not religious or a Biblical scholar, but the existence of this book has always fascinated me. After reading it I can say that unless you are religious or a Biblical scholar, this book probably has little in the way of value with but one exception: the parts about Jesus' younger years.
Young Jesus was a bit of a jerk. Much like Anakin Skywalker, a young Jesus sometimes abused his power for trivial things like bumping into him. He made kids go blind and worse. Sometimes, though, he just used his powers to amuse friends, such as the time he fashioned some small animals from mud and then made them come alive.
That is such a small section of this book, however, and the rest is filled with visions about why you should worship God and Jesus and forsake evil -- things that are already in the Bible, just told a different way.