God would most likely be an alien if he exisisted.
No God is a magical man.... Kinda like a wizard harry !
considering that it means extra terrestrial. (not of this earth) since he created this earth, he's not from it.
Alien means not of this Earth. Given the fact that theists believe God created the Earth and universe, then he is not of this Earth making him technically an alien.
He wouldn't have been born on earth, thus he would be extra terrestrial = alien.
Although he doesn't exist at all
I do not believe in God, in fact, I believe that there is no god. However, if one were to think of a possible "God" there are only two versions: The "God" of the laws of physics - IE: a god without sentience. A super-advanced alien civilization capable of creating universes. As for creating life from scratch? Heck, give us a few of years and we could do that, we already know how. We just need the proper equipment. Though yeah, it was an accident.