Someone else asked this question (until then I didn't know what the 10-40 window was). I looked into it, and I think it's an interesting question that deserves its own thread. Here's a quote from his question: Here are some interesting statistics about the 10-40 window. (Caution: Various web sites on the 10-40 window have significantly different statistics about it, but not different enough to make that the focus of discussion. I just want to mention that the statistics vary, in case you happen to find one that disagrees with the statistics I pulled.) From: http://www.ocf.berkeley.edu/~samkong/mission/1040.php ...71 % of all Muslims, 98 % of all Hindus, and 68% of all Buddhists live in the 10/40 Window. ...There are 34 Muslims countries, 7 Buddhist nations, 3 Marxist nations and 2 Hindu countries in the Window.* ...There are 55 countries in the world that are considered "Unevangelized." 97% of these are in this Window.* ...There are over 1.3 billion people living in the Window who have little or no chance to hear the gospel. ...In the Window, we find 86% of the people group which are less than 2% Christian.* ...There are 500 people group in the Window that have never heard the Gospel.* ...Only 1.2% of all mission fund go to the Window.* ...Only 1% of all Scripture distribution are distributed to the 10/40 Window.* ...Only 3% of all the languages for which the Bible has been translated are directed toward the Window.* ...9 out of the 10 countries where the physical persecution of Christians is the most severe is in the Window.* ...The greatest revival ever on earth is taking place in the 10/40 Window countries of Asia? Every day in communist China over 25,000 people accept Christ. In India, an estimated 15,000 people are turning to Jesus daily. In the early eighties there were only 15,000 known Christians in the Himalayan country of Nepal compared to over 200,000 followers of Christ today. ------- Now, what does this have to do with Theology and Bible Study? IMO, a lot, but I'd rather read responses of those who see a connection than make my own at this point. As an aside, I found the wording here amusing: ...In the Window, we find 86% of the people group which are less than 2% Christian. I didn't realize it was possible for any Christian to be less than 100% Christian.