Revelation 7:9 After this I looked, and there before me was a great multitude that no one could count, from every nation, tribe, people and language, standing before the throne and before the Lamb. They were wearing white robes and were holding palm branches in their hands. 
No one is without excuse…there will be people from EVERY nation, tribe, and language…even places that are untouched by modern society. Praise to our Lord who saves those who are willing to accept Him!