Well, creation was made for one god, which happens to look just like us and never once mentions other peoples. To be a Christian astronomer you have to believe one of these:
1. God is wasting the vast, vast, vast majority of the universe on emptiness while he focuses on his fave planet.
2. The universe is full of humans, in which case Jesus is presumably getting re-crucified every few seconds to absolve new groups. Or I guess maybe he split up into a trillion copies that all got crucified at once? Or we’re the 1-in-a-trillion lucky ones that everyone else just gets to hear about?
3. The rest of the universe has aliens because god got bored/wanted things for us to play with, as his super special favorite species. The aliens don’t get to look like god, ofc.
No offense intended to anyone, but I don’t see how you could possibly accept Christian doctrine without necessarily thinking of earth as unfathomably special.