That's the way it's always been. That's the way it always will be. To quell mission doubts like these, we need to claim the Bible's mission promises. No, He is telling us that there will be men, women and children from every language, tribe and people group who will become citizens of heaven through faith in Christ. His promise is sure.
Missions is worth shouting about.
Pray for the four groups you ve identified. Start planning ways you and your fellow Christians can reach out to them.