This is truly shameful to be forced to admit, but I am unable to locate a rare book I read over a decade (because I can’t remember the author or the title) , so I am appealing to the vast and eclectic minds of the Dope. It was written by a rabbi and was a very blunt in-your-face refuting of the Christain mythology around Jesus of Nazarus. The title was Jesus something or other. For a long time I thought it was Jesus Meshuganah (i.e., Jesus crazy guy) and searched for this in vain, but that has yielded no results. The main qualities that so distinguished this book was 1.) it was recent within the last 50 years; 2.) it was not an academic or theology book; and 3.) it had a style of in-your-face-Christianity-is-bunk attitude that usually isn’t seen outside of the more militant atheists’ writing (He refers to Jesus sarcastially as Superbaby at one point, I remember that very well). Still, it was an incredibly good read, compressing a lot of anti-Christian mythology talking points into sound-bites basically. All of this is probably why I haven’t been able to locate this book.
The Jesus Incident?
The Incredible Shrinking Son of Man: How Reliable is the Gospel Tradition by Robert M. Price. It’s from 2003, though. It might be too recent for the book you’re thinking of.
He does call Jesus a superbaby in the book.