“In the Genesis framework, “aliens” must have been created on earth, and at the same time as sentient humans.
...
“So we must believe one or the other.”
I think it’s POSSIBLE that God may have created other worlds with other beings, with their own specific paths to salvation, their own similar/parallel equivalents to our Scripture and Earth’s Book of Genesis. I don’t believe that’s true, but think it’s possible. We think within the constraints of our finite conceptions (or misconceptions) about everything.
If true, then Heaven might look like the bar scene in Star Wars.
God is attended to by an infinite number of beings (angels is not the correct term). They are not here on Earth.
People who believe that humans are all there is are either not reading the Bible or they have no imagination...or both.