If there are aliens living in some far distant galaxy, what does that say about God?
What does that say about the Bible?
Nothing at all. It doesn't say anything about fictional stories.
What does that say about creation?
If you choose to believe in the creation myth you might want to expand the parameters of the story to include this as a possibility.
What does that say about evolution?
It doesn't affect the theory of natural selection at all.
This changes everything we have been taught.
No, it doesn't "change" anything. If the existence of these aliens is ever proven we simply add that discovery to what we already know.
nycdad, you're acting as if advanced intelligent life in distant galaxies is a known fact. It isn't. It's all hypothetical. It's no more world-changing than any other idea that has no evidence to support it.