Also depends somewhat on your theological/philosophical concept of God. For example, anyone who ascribes to Perfect Being Theology (for example, any follower of Judaism/Christianity/Islam) would reject any sort of alien creator as a god, even if they had in fact created humanity.
But humans have a tendency to find gods where they don't belong, so if any race did appear and claim such godhood I would expect a large population would take those claims at face value.
And of course, as monster mentioned, depending on your definition of aliens, basically any creator god would be considered an alien. Or at least the vast majority.
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