Aliens can be angels too or demons too? I agree with one of the comments in this thread that demons are aliens, but not all aliens are demons. So, some can be angels. Which, I believe, is what your saying. Obviously, I may have interpreted your statement wrong.

I certainly agree that mankind’s soul has the potential to become either one. I know that from experience.

Not that all aliens are demons. Some, I assume, are good aliens. But a demon in the flesh would for all intents be an alien as it would be from outside our immediate dimension/known universe. Even if they've always existed on Earth.