Breathe
Hostis humani generis
From a monotheistic perspective, yes, however many polytheistic faiths are not so - gods were begotten in Ásatrú and wotnot, this is why polytheistic deities can be more difficult to separate as aliens. If we seperate the belief that God was once created, then it becomes the "who created God?" thing. At a guess an alien would have to evolve. If it's similar to the polytheistic style, then we're left with aliens again - or, an alien who might be some kind of mad scientist.No, there seemed to be an argument that God is God because he always existed. How do we know this? God told them, and he told the people who wrote the book.
In my view, for example, the Mormonism concept of God is pretty alienesque.
Then to many they would be like gods, yet there could have been a time when they were not, and they could have evolved from anything.As for the last part, we are talking about far-future aliens here. Who says they even reproduce? Perhaps they might use cloning machines. They might be immortal, or disembodied energy (just like 2010: Odyssey Two - because the thread has already referenced 2001) or something equally outlandish.
This is why the Hindu concept is much better.