I don't believe in aliens, but I do believe in angels and demons. I believe ancient man got help from the offspring of demons and human women. In the Bible it says the "Sons of God" hooked up with human women and produced offspring who were mighty men of renown. I think they are referred to as "Nephilium".
I think these offspring were far more intelligent and stronger than your average human and helped their "brother man" do the things they did. I also think this is one of the reason God brought about the flood because these half human/half demon folks were messing up God's plan and diluting what He wanted Humans to know and understand.
I just don't buy aliens with technology to span billions of miles of space, plopping down here on earth to help a couple of dumb humans stack stones on top of one another. If an alien race really was going to interfere with the human race it would make more sense to actually give them stuff important like cures for diseases or easier and quicker ways to grow food than to build a pyramid.
If an alien race were to find Earth they would do one of three things.
1. Look at what we have done to the planet and move on.
2. Enslave us
3. Help us either overtly or covertly.
Don't you understand that the Bible isn't describing real events? The stories are allegorical and meant for a society that is two millennia out of date.
What I find fascinating are folks who actually have a book from God telling them "Hey, I exist and here is how things are" yet they refuse to believe, but have no proof of aliens existing, but will believe in them instead.
I just don't believe in aliens because the Bible states God made us "a little lower than the angels". Angels are powerful beings who don't need space ships and if we are just a little lower than they are I don't believe He created something else that is in between us.
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Even if the aliens got lucky and flew by us and decided to stop in and have a look, I still don't see them caring much about us and if they did, like I asked in an earlier post, why didn't they give us something that matters like cures for cancer or better food production?