In Mark 13:10 says: And the gospel must first be published among all nations.
In Matthew 24:14 says: 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.
This is what are these chapters of the Bible is sayings:
[1] Gospel of the kingdom [2] Preached in the entire world [3] For a witness [4] Then shall the end come.
It said there should be a universal preaching of the good tidings or good news of the coming kingdom which is the millennium kingdom of Jesus Christ on earth for a testimony to all nations.
When the universal publication or preaching of the gospel of the kingdom have be accomplished, then the end will come, then no more preaching of the gospel, the resurrection and the rapture will take place.
And then a period shall be put to the whole Jewish economy, by the utter destruction of their city and the temple.
Note it is not here said that all will be saved, but it is a witness to end of the gospel preaching or publication in the world, to some it is the savour of death unto death, to others the savour of life unto life.
The design and end of the gospel’s preaching or publication and that is, for a witness or testimony, namely for a witness of the gospel of the kingdom, which is the God’s grace and mercy offered to sinners and of their obstinacy who rejects it.
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What will become of Muslims, Hindus, Buddhists, Jews, Animists and unruly Christians? Africa heard the gospel for the first time about 300 years ago. What will be the fate of Africans who never heard about Jesus Christ?

All Christians will answer the question because Jesus Christ have commanded them to go ye to all nations and preach to them to bring an end to the work of preaching or evangelism. So that rapture may take place. Please log to this site to understand more: www.iwwm.org