That is a kinder surmising.
Otherwise, they would have to be sinless.
They can be presented the Gospel (one Christian apparently evangelized to fish), but Christ died for Mankind. Christ took on human form. That taking on human form could have been necessary.
The kinsman redeemer was a kinsman (relative). God could have became human to become a relative to and part of the human race (family), because the substitute sacrifice to pay for Mankind had to be a relative to Mankind.
Such (hypothetical and probably nonexistent) extraterrestrials would not be related to humans (unless they were humans), and thus them not having souls is the kinder way to go.
To think that the human race is God’s ONLY interest is ALMOST as hubristic as believing in anthropogenic global warming.
Do YOU have only ONE interest? Do YOU have a personal line to God and His thoughts?
Holy arrogance, “master”.