I  hold no brief for any version of Christianity, but this piece in Slate is a nice overview of the ludicrously off-the-mark history much of the Code is based off of.

I’m perfectly willing to discuss a historical Jesus — his lack of divinity don’t bother me none. But if you’re going to make up a story like this, you might want to start with at least a cursory understanding of what various early Christian sects believed.