In this post, I pose a question to my readers, and we discuss what the answer might be.
Question: If an atheist does not convert to belief in God, can he possibly be saved and have eternal life in Heaven? If so, what are the conditions that he must meet?
the reproach of Christ 
If God has created rational physical life on other planets, and they have Fallen, would He have to incarnate on those other planets to Redeem them?
I think the doctrine of salvation is quite clear that Christ died once for all. So He cannot become incarnate again — not because he lacks the power — because a second incarnation and second death would contradict His own teachings. Other fallen rational beings would be saved by natural law, by following conscience, just as before Divine Revelation began (when the OT books began to be given to humanity).