Will all Christians be Kings and Priests?

It is common to hear among the Christian people that we will all be Kings and Priests, however, the word of God says that only the chosen ones will receive this great privilege.
One God, but do we have only one word?

All Christian denominations worship the same God, however, most teach different doctrines, and in many cases opposed to each other, when the Bible says that there are not many gospels.
The last great harvest of souls

The last great harvest of souls has nothing to do with a revival in the Christian churches, but with the return of Jesus Christ to earth.
The Kingdom of God

The Kingdom of God will be established on Earth upon Jesus Christ’s return, bringing peace, justice, and everlasting righteousness as foretold in the Scriptures.
Jehovah’s Day of Vengeance

The Old Testament predicts that the final days will be filled with devastation and chaos around the world, this event known as Jehovah’s Day of Vengeance is the same event described in the New Testament as the return of Jesus Christ to earth.
Only the righteous shall inherit the earth

God has promised his people that they will inherit all things, but he specifically mentions that only the righteous will inherit the earth, so what will become of those who do not know about Jesus?