All life in the Universe originated on Earth. There is only one God and he has made the earth his habitation. If there is alien life on other planets, it originated on earth. The only habitable planet in the Universe for humans is earth.
Ok Susan, if thats what you believe. It is however a guess based on absolutely no knowledge but hey, thats what faith is all about
But which god is that? I favour Anoia, the god(des) of things that get stuck in draws. I often shout her name in vain as i rattle a draw and mutter *it went in there ok. Why wont it open*
Anoia - Discworld & Terry Pratchett Wiki