but a martian alien does? really?
If it can get here, that would imply intelligence as that would not be an act of instinct but an act of will so either the alien could either be:
a) sinless
b) have free will.
I think C.S. Lewis did a series of books on this back in the day.
If they are sentient beings, yes. That’s what I said above. I would assume any race of beings capable of space travel would have the capacity to reason. And sin.