http://bibleorquran.webs.com/game.swf (http://bibleorquran.webs.com/game.swf)
This game was posted on the Atheism subreddit and I think it's kinda hilarious. There's a passage listed, either from the Bible or the Qur'an, and you have to guess which is which. I've only had about a 67% success rate so far. It's a great way to illustrate that religions that seem dissimilar, and the members of which assume the others are so much worse, are actually similar to the point of being indistinguishable. Gotta love perspective!
So far, I'm getting about 90% right - but I was a devout christian for over 30 years, even if I have been an atheist for over 12 years.
I do extremely well on some of the categories and poorly on others.
Oh good! Somebody made better use of my idea (http://www.happyatheistforum.com/viewtopic.php?f=2&t=6090) than I had.