A question to which I have no answer. But I am content to simply say, "I don't know". I feel no compelling need to suggest that it must have all been the result of some giant supernatural bearded guy. (and yet fail to explain where he came from)
I contest this, and the origin of life, needs something beyond observable science-indeed, we can never prove the exact origin of the universe. We can try, and accumulate evidence to support various theory's, but we can not prove it (or do you disagree?).
We certainly can't prove anything in regards to this question, with the evidence currently available to us.