And that's 100 miilion units per year. Year after year. I think Twilight probably won't match it, for what its worth.
Ahem. I see several problems with this idea without any effort.
Owning a bible and reading a bible are not the same thing - how many of the 100 million units purchased each year get read rather than set on a shelf?
How many bibles are purchased as gifts? It's very common in Catholic circles to get a beautiful edition of the bible at confirmation or at baptism. I assume that other religions encourage the purchase of bibles as gifts as well.
Speaking of Catholics, they do make up the majority of the christian population world-wide; although screwtape was being somewhat facetious when he commented that Catholics don't read the bible, it's based on reality.
Even here in the states where believers are in your face about it believers don't read the bible. I lost track of how many emails I got in the last two elections that quoted a passage from Revelations that indicated that Obama might be the Anti-Christ. The only problem is that the quoted passage doesn't exist
- which no one who was so foolish as to send me that particular email was aware of but might have known if they had ever actually read the book they were quoting. No worries, of course I showed them why they were wrong, and copied everyone they included in the forwards to me. My own mother didn't escape that one.
I'm an atheist. I own 4 different versions of the bible, all of which I purchased myself since realizing that I don't believe in the christian god. The Brick Bible is the only one unboxed (at my house 70 miles away). I did, however, bring my copy of God's Lunatics with me to my apartment, just in case I get caught by a pushy theist.
Huge sales do not translate to anything meaningful. All purchases are not being made by theists. All purchases are not resulting in people reading the bible and being persuaded of it's authenticity. All purchases are not even translating in people reading it at all. You can use that statistic to support your point, I'd just be wary of expecting it to be an effective approach with this particular audience - you ought to ask how many bibles we atheists collectively own before getting too excited about sales figures.