This points out a problem with Christianity and ETs.
Do the ETs have an eternal soul? If not, end of discussion.
If so, are they sinful? If not, end of discussion, they will spend eternity with God.
If so, did they ALSO have an Adam that sinned, and was it simultaneous with “our” Adam (”all creation” was cursed at that moment)?
Now, about salvation - in Christian belief, that is only achieved through believing on Jesus and His sacrifice on the cross, “once for all”. Did Jesus die on “our” cross for the sinful aliens, or did He have to go to each planet and do it over and over again?
Left out one - if they aren’t sinful, why are they suffering “all creation”’s curse for Adam’s sin?