You've simply transfered the question of our origins to another planet or galaxy.
Where did the space travelers come from?
Did somebody seed them, too?
Sooner or later you have to confront the same question, don't you?
Where and how did life originate?
"You've simply transfered the question of our origins to another planet or galaxy."
Good point. While I personally favor evolution, you could argue that even if we were seeded here from another planet, that planet's population may have been created by God.
I guess the thing is, even if that is what happened, it would still mean that our existing theology was incorrect.