We must go to the racetrack to see the "others." One of the races is a match race between two horses. (Actually one of them is a gelding.) Here is the post position:
1. The God Delusion
2. The Da Vinci Code
Really? You're comparing the sales of a work of fiction vs. a scholarly book written for a lay audience? This is Doing It Wrong--scholarly books, even the best-written, will always sell less than a fiction work of similar apparent popularity. It's the way the mediums work. So your entire analysis is based on a deeply flawed premise.
Who are those folks who bought those 80 million copies of Ed Brown's book? You can try the elimination method and ask who was unlikely to go to the bookstore to get it.
Um.......no. Several reasons. First, there's no way to predict this. I mean, I've been on the road on long trips and needed a book to fill hotel time, and you purchase some weird stuff doing that. "Hey, that looks interesting! It has pictures!" (my logic for purchasing TdVC). Second, what any individual purchases is not necessary important--if other individuals purchase multiple copies (I know relatives that gave out a few copies as gifts) you can get much higher numbers of books sold than you have purchasers of said book. This is an economics thing, and you apparently don't understand economics at all.
I don't think that the populous subset of theists called the Christians was responsible for the best part of the 80 million copies sold. And that leaves the atheists as the only option. But the book is said to have been criticized for its historical and scientific inaccuracies, and as we know, the atheists are very partial to anything that is scientifically correct and instrumental in refuting the basis religions stand on. So are there actually "the others?"
The highlighted part is not an argument at all, merely hand-waving away an argument. Besides, peopel who self-identify as Christians aren't all the same. Most of my family is Christian, and most have a copy of TdVC and Holy Blood, Holy Grail. They read them for laughs.
The italicized part is is pure bovine fecies. The options aren't Christian vs. Atheist, but Christian vs. [insert all other religions here] vs. atheists. You've dismissed a huge swath of the population for literally no reason, not even the bad hand-waving you used to dismiss Christians as purchasers!
The bolded part is just silly. I have a copy of Starship Troopers 2, just to point and laugh at it. And atheists indulge in many forms of entertainment which aren't 100% scientifically accurate. The Hitchhiker's Guide to the Galaxy comes to mind.
The underlined part does logically follow--if you eliminate everyone, there's no one left. However, you didn't eliminate them for valid reasons, and therefore your conclusion is wrong.
Why would a fiction novel be criticized for its inaccurate historical and scientific content?
Because it's fun. Because Dan Brown was an idiot. Because people like you (and the RCC) take it as true. Take your pick.
There was plenty of opportunities to do so with Richard Dawkin's book, which bridged science and philosophy with something that no one in his right mind would walk on.
No True Scottsman, plus Argument from Intimidation.
Let me show you an example of complex and simple, so the next time you will understand the difference.
Tell me which is simpler: Platihelmenti or Porifera. I'll wait.