"At least 1.5 billion people in the world have NEVER even heard about Christ and the Good News. How easily that number slides off our lips with little comprehension of what it means! One of the problems is that we are myopic and see what is close to us. That is why 97.5% of the money in the (U.S.) offering plates stays at home and only 2.5% gets to the rest of the world." - Avery Willis, Executive Director, International Orality Network
And I'll add that only 1% of that goes to unreached people groups representing people in nations with not one self-sustaining church.