Elderman -
I've found the source of your above quotes...
http://en.wikipedia.o...7_Warning_to_Humanity
You didn't make them up after all! I stand corrected.
However, nothing of this has got anything whatsoever to do with evolution. You also seem to be attempting to changing the argument. You're now saying that, “... If some scientists are willing to speculate that life came from an extraterrestrial source, what is the basis for ruling out God as that source?”. Some scientists are indeed saying this but they're not suggesting that biologically complex bipedal mammals came from outer space. They're talking about micro-organisms and hence, evolution.
This argument has already been made by others on this thread but you started by saying that, “... the theory that all life evolved from a common ancestor is not a scientific fact...” when, in fact, it is.
You seem to be back-peddling dramatically into a corner. Not surprisingly, this is common behaviour for theists when confronted with scientific facts. They cannot reasonably argue against observed evidence and logical deduction and so continue to pull back and retreat until they find a question that science cannot yet provide an answer for. In the case of evolution, it is the unknown mechanism that caused the primordial 'soup' to create self-replicating biomolecules.
This is apparently where god comes in – in the gaps of current scientific knowledge.
http://en.wikipedia.org/wiki/God_of_the_gaps