Has the gospel been "preached to all nations"? Concerning the end of the world and when this will happen Mark 13:10 says:


  And the gospel must first be preached to all nations. (NIV)


Has the gospel been preached to all nations?
No.

The word translated 'nations' is ἔθνος (ethnos), from which we derive the word 'ethnic'. It is talking about ethnic communities, which we might call people groups today, not political states.

The Joshua Project estimates that there are 16,825 people groups in the word. Of those, 7,287 are unreached, by which they mean "less than 2% Evangelical Christian and less than 5% Christian Adherents". Because there are so few Christians in an unreached people group they will struggle to evangelise their own group with the gospel, which means many Christians believe they need outside missionary help. This represents 2.91 billion people.

The International Mission Board estimates there are 2,945 unengaged people groups. An unengaged people group is one where there are no Christian in the group, and no plan for anyone to take the gospel to them. They estimate there are over 190 million people in unengaged people groups.