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Matthew 24:14 And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come.
A few years ago I read a news story about a newly discovered people in the Amazon rain forest.
Here's a link to the story, and video.
BBC News - First film footage of remote Amazon rainforest tribe
These people had no contact with the outside world. Who knows how many more are out there like them?
I've heard people speculate about what will become of those who have never heard of Jesus or the gospel of the Kingdom.
But our mighty God has this covered!
Revelation 14:6 And I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people,
Revelation 14:7 Saying with a loud voice, Fear God, and give glory to him; for the hour of his judgment is come: and worship him that made heaven, and earth, and the sea, and the fountains of waters.
Revelation 14:8 And there followed another angel, saying, Babylon is fallen, is fallen, that great city, because she made all nations drink of the wine of the wrath of her fornication.