God is spirit, and as such he doesn’t have a body (Lk 24:39: “A spirit does not have flesh and bone.”). When the Bible speaks of our being made in his image, then, it doesn’t mean we’re like him physically. It means that, like God, we possess a spiritual aspect to our being. Like God, we can truly know, will, and love.
He could certainly have made other worlds and other forms of life. God is like the 800lb gorilla, He can do anything He wants.
And He could, by your logic, create a rock that is too heavy for Him to lift, as philosophers are fond of pointing out. However, He is supremely logical among all His other attributes. He will not offend the dictates of logic by dong something so utterly pointless as creating a rock that is too heavy for Him to lift.
And no-one seems to get that a being that is ONE, as God is ONE, has only ONE image and likeness, with all that entails. It is equally illogical for a being who is ONE to have more than one type of image and likeness as it is for Him to create a rock that He cannot lift.
Scripture is clear - this is not some loose kinda ‘all spiritual/sentient beings are in God’s image’ kinda notion either. Angels not only possess a spiritual aspect to their being, they are in fact all spirit. They too are like God in that respect, however they are
not described as being made in His image and likeness.
The reason for this is obvious - because in the person of Jesus God’s image and likeness is BOTH fleshly (human form and nature, deliberately chosen - two eyes and all) AND spiritual, and humans are the only beings who combine the two likenesses. Unlike Zeus and Jupiter, our God is not recorded as regularly making appearances in the form of other creatures - bulls, swans or the like.
Sorry to burst your bubble, Strawberry Jam, but scripture, and divine revelation in general, goes well beyond the bare bones of what is necessary for our salvation.
In fact it is not necessary for our salvation in the slightest for us to know that WE are made in His image and likeness. Lots of pagans were happy to worship Gods that were forces of nature. Clearly the lack of belief that they were made in the image and likeness of their gods was no hindrance to their worship. Nor would it be to ours to not be told that we were made in His image and likeness.
And scripture goes well beyond bare bones in many other ways. For example, it is not necessary for our salvation to know that God created the world - or us! The ancient Greeks were quite content to worship and serve their pantheons without believing that each of their gods played a part in creation.
It is not, per Church teaching, strictly necessary for salvation to even know the name of Jesus Christ, or about many of His teachings - provided that such ignorance does not arise through our own fault or negligence, but it is truly ‘invincible’.
It is not necessary for us to know that there will be a Second Coming - the knowledge that we will come face to face with God when we die, and will be judged by Him at that point, is more than sufficient.
Point being, while scripture isn’t complete, it certainly is a great deal more than the bare minimum as well, and the particular stipulation about image and likeness is one of those areas in which it exceeds. It is part of the revelation of all truth which we have ultimately been promised.
And as for what Augustine said about people on other stars - well, people on other stars are still people after all, still of the species homo sapiens. It doesn’t speak to other species at all.
