Haven't seen it yet, but there is one thing about these books, movies, and theories about Christ having a continuing bloodline that does bother me. They all seem to show this very linear bloodline that leads back to a single family. Now maybe it's just the engineer in me but this got my fiance and thinking. And even using a conservative estimate of two offspring per generation the produce two more off spring, and no intermarriage, after 80 generations (assuming a 25 year standard generation measure) you would get descendants measureing 1.2 x 10^24 people. Of course this is far larger then the world population, but even assuming intermarriage that basically implies that the whole of Europe, at the very least, would share in at least some genetic level the bloodline of Christ.