That is an interesting question.

My theory is that if aliens exist which I believe they
do, they might have something to do with the fallen angels mating with human women and creating giants. An off shoot of that mixing. I know a lot of people don’t believe the sons of God were fallen angels but I do believe it, especially when you read the book of Enoch which I know is not cannon but was referenced to in one of the books that **is **cannon. Plus the Bible does say that Enoch was taken and did not have to see death. The book of Enoch plainly tells that the sons of God in Genesis were indeed the fallen angels and they did mate with human women.
As far as aliens being saved, the fall of man was limited to humanity on earth, it’s the history of humanity **on earth **so if the aliens have nothing to do with the fallen angels and are just other beings God created, they might not necessarily be in a fallen state in which they would need to be saved or baptized. Maybe their species lived the way God truly made them to live so they might not necessarily need to be baptized.

The only way they might need to be baptized is if they descended from humans on earth and somehow ended up on another planet.
Anyone who does not believe in aliens, or the fallen angels mating with human women should read the book of Enoch.

You don’t have to take it as cannon scripture but read it for reference and see if you still think the sons of God in Genesis was just a way to describe other humans.
Exactly! Here we go with this again!

The evidence is overwhelming!
Here’s part of the Book of Enoch, and remember, one of the books of the Bible that **is **canon made a reference to this book. :
VI-XI. The Fall of the Angels: the Demoralisation of Mankind: the Intercession of the Angels on behalf of Mankind. The Dooms pronounced by God on the Angels: the Messianic Kingdom (a Noah fragment).
CHAPTER VI.
- And it came to pass when the children of men had multiplied that in those days were born unto them beautiful and comely daughters. 2.** And the angels, the children of the heaven, saw and lusted after them, **and said to one another: ‘Come, let us choose us wives from among the children of men and beget us children.’ 3. And Semjâzâ, who was their leader, said unto them: ‘I fear ye will not indeed agree to do this deed, and I alone shall have to pay the penalty of a great sin.’ 4. And they all answered
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him and said: ‘Let us all swear an oath, and all bind ourselves by mutual imprecations not to abandon this plan but to do this thing.’ 5. Then sware they all together and bound themselves by mutual imprecations upon it. 6. And they were in all two hundred; who descended ⌈in the days⌉ of Jared on the summit of Mount Hermon, and they called it Mount Hermon, because they had sworn and bound themselves by mutual imprecations upon it. 7. And these are the names of their leaders: Sêmîazâz, their leader, Arâkîba, Râmêêl, Kôkabîêl, Tâmîêl, Râmîêl, Dânêl, Êzêqêêl, Barâqîjâl, Asâêl, Armârôs, Batârêl, Anânêl, Zaqîêl, Samsâpêêl, Satarêl, Tûrêl, Jômjâêl, Sariêl. 8. These are their chiefs of tens.