Some Christians take the Bible so literally that they believe there is and has been only one Jesus.
So if there were beings from other planets, their first knowledge of Jesus would only be upon listening to our transmissions or communicating with us.
It seems unfair enough to some Christians that Jesus was most likely unknown to Native Americans, Chinese, Indians, etc. but to expect lizard people from Voltron to accept Jesus as their Lord and Savior without hearing word one about him unless they happen to visit Earth, is unfairness to the Nth degree.
Some believe that if there are aliens that Jesus will have appeared on all of those planets as well. Others believe that for the Bible to be 100% accurate, then there can be no other sentient beings besides humans. They believe that if it ever appears that we are being visited by aliens, it will either be trickery on the part of the Illuminati or demons from hell impersonating aliens.
So yes, the possible existence of alien species light years away from Earth who most likely will never come in contact with us is very troubling to some Christians.
Christians still go to pagan countries as missionaries and if we find other intelligent people in the universe then I have no doubt that Christians will reach out to them and that Wycliffe will get right to work translating the Bible into their language!
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Yes some like C. S. Lewis posited multiple civilizations and multiple manifestations of Christ. Note extremely well that this would not be multiple Christs unless the Trinity Himself is relative. Go there if you want.
However the fault is placed with humanity in biblical theology. Not with humanity plus E.T.
C.S. Lewis addressed the issue of distant alien life forms accepting salvation through Christ. He raised the question, “What if they were an unfallen species already in complete conformance with Gods laws, would they have the desperate need for a Savior?
We have a hard enough task to remove the beam from our eyes much less speculating on the dust mote in others eyes light years distant. Draw water, chop wood...
I’m one of those who takes it 100% literally.
If there was ever a deception the enemy of humanity, you may know him as Satan, that would trigger mass hysteria and make humanity abdicate total control to his will - it would be “ALIENS” (Demons) showing up in the skies for all to see.
Read 2 Thessalonians 2:9-12.
What kind of lie do you think God would allow an unbelieving world to be brought upon the Earth that could equal the impact of what is written?
IMHO, “aliens” will play a huge role in the end of days that are literally upon us.