>There's the possibility that God created life on Earth but it has evolved naturally elsewhere through the same processes by which our created version of life mutates.
That's a religious argument. It's unprovable and unknowable.
I'm not making any kind of argument for proof of this idea, just stating that the idea of creationism on Earth doesn't reduce the probability of evolution to 0. Some religions even make the claim that God is an alien.
Given the language issues of the time, perhaps it is Biblical that life was created elsewhere and our ancestors arrived on this particular lump of dirt as spores on a meteor. Perhaps the same on the aliens planet. That would make aliens cousins rather than ... independent test tube creations or whatever. I suspect that given proof of alien civilization this would be a fairly popular outlook among existing believers.
That's a religious argument. It's unprovable and unknowable.