Did Jesus die for little green men?

Now imagine the universe is teeming with other intelligent civilizations. What is a Christian believer supposed to say? Claiming that Christ died only for us, while the rest of the universe is screwed, would be incompatible with God’s love. If, however, earthly Jesus died for the whole universe, myriads of extraterrestrial sinners included, we would have to accept a geocentrism even more preposterous than the spatial variant. Neither is there a way out by suggesting that other intelligent species may not have been “fallen.” This proposal amounts to a negative human exceptionalism that is totally unbelievable, given that alien species are subject to the same general evolutionary mechanisms as we are. Natural selection favours “selfish” traits.

What about multiple incarnations? Here another difficulty of traditional Christian doctrine comes into play: Christ has two natures—he is “truly God and truly man.” But how are members of completely different biological species (“truly man” and “truly Klingon,” let’s say) supposed to stand in a relationship of personal identity? Even worse, if the number of sinful species in the universe exceeds a certain threshold, God would be forced to incarnate himself simultaneously. However, no single person who is an embodied being with a finite nature, i.e. a “truly” biological organism, can be more than one such being at the same time. If, on the other hand, the incarnations were not personally identical, many different persons with a divine nature would result—too many even for a Christian. Finally: May extraterrestrial sinners have been reconciled to God by means different from a divine incarnation? Perhaps, but even if the Christian believer concedes alternative means of salvation she is stuck with the highly implausible geocentric claim that the incarnation, i.e. one of the most remarkable events in the history of the cosmos, happens just 2000 years ago on our planet, although myriads of other inhabited planets were also available.

Therefore, I conclude, the traditional Christian believer can’t make theological sense of extraterrestrial intelligent life.

https://gizmodo.com/which-religion-is-friendliest-to-the-idea-of-aliens-1841241730

i) Unless and until we discover aliens, or they discover us, this is purely academic. Even if this might be a defeater for Christianity, it's a hypothetical defeater, not a demonstrable defeater. 

ii) Calvinists, who subscribe to limited atonement, reject an assumption of his argument.

iii) According to Scripture, many angels are fallen, but no provision was made for their redemption.

iv) There's no reason to think the fall of Adam would implicate inhumane species in original sin. Aliens are not Adam's posterity. Adam is not their federal head.

v) Assuming that aliens exist, there's no presumption that they are fallen. Hence, there's no presumption that aliens require an atonement even if they do exist.

vi) The doctrine of original sin isn't based on evolution. Indeed, theistic evolution typically denies a historic fall.

vii) There's no presumption that if aliens exist, they are the product of evolution rather than special creation. 

viii) The Incarnation is unique in reference to the Son becoming human. In principle, the Incarnation is repeatable in reference to the Son assuming the nature of other intelligent creatures. The uniqueness of the Incarnation doesn't preclude multiple incarnations in that respect because each incarnation would be a unique, unrepeatable union  between the Son and the nature of an intelligent species. 

ix) It's not contrary to personal identity for the Son to form a hypostatic union with more than one species. It would be the same timeless, spaceless Son at one end of the relation. Although there'd be more than one individual creature at the other end of the relation, that would just mean the Son qua Incarnate is not uniquely identical to any particular instance of incarnation, but identical to the ensemble. 

To take a comparison: suppose God created a multiverse. In that event, God is the Creator of each separate universe as well as the multiverse. His identity as Creator operates at more than one level. The Creator of the set as well as the subsets. 

x) In the nature of the case, Bible history zeros in on earth history and human history. It's silent on the question of alien life. It's silent on the question of a multiverse. It doesn't speak to those hypotheticals one way or the other. It doesn't address the world history of aliens on other planets, assuming they exist. For the record, I have no opinion about the existence of aliens in our universe.