Neither Rev 5:10 or Luke 12:32. say anything about Christians who are unjustified, not in the New Covenant, and bereft of the indwelling Holy Spirit and the heavenly hope.
Axiomatically does because only christians are saved based on the ransom and nobody else. However Jesus refers to christians with the heavenly hope as a little flock. Little flock compared to what? Billions of goats or a lager flock of christians that are not the bride of christ. Revelation also describes a populated earth. Of who? Heathens or Christians under the heavenly rule of the Messianic kingdom consisting of Jesus and the New Jerusalem? It is very obvious that many christians will inhabit the earth after the final judgment.