I'm surprised that with that verse there's not a small contingent of "genealogists dance with the devil!!" ideologue out there...
I've never googled it myself, so there probably is.
I thought it was a good book, a nice fast read. I discovered Dan Brown a few years ago, when he was on the remnants pile. I laugh every time I see one of the old books sitting on a B&N bestseller rack.
The whole Holy Blood Holy Grail thing was something I read in High School. I will admit to buying into it for a while. Then the internet came along and I read more about the "for" and "against" side.
In the end it all sounded like one of those folks on Art Bell's old shows. They always said they had the proof, but the government was going to have them killed if they showed anyone...but you really needed to believe them.
It all comes down to faith. Either you believe (in the Bible) or you dont. It is not complicated at all. In fact, like most issues that seem very complicated...the answer is quite simple.