I'l have to contemplate this deeply, but here are some immediate thoughts.
Did it happen by itself? Well, it is virtual, right? It's not real, no more than a virtual physics experiment. If we actually managed to pull off an experiment where we somehow plant some cells in an ideal planet and life springs up, well yeah. MAnkind would have created the life on that world (and therefore they are all our SLAVES!!!
just kidding). But the thing is, the cells still have to evolve. Evolution and that whole theory is still needed to explain it. Even if you bring a big huge Noah's ark full of stuff, the whole artificial ecosystem is still going to evolve. The animals/plants with the traits that enable them to survive better will thrive (of course, there is no single best trait. Some areas might require different traits to survive there). Thus, the organisms with those traits and those genes will pass them on to their offspring. The whole passing on of genes will cause further evolution.
And one thing. Just because there is no perfect, good scientific theory for a specific slot (like the creation of life) does NOT mean that you can just stick another theory in there, such as creationism or intelligent design, without sufficient verification by concrete, measurable physical evidence.
And besides, the whole theory about creationism. There is no way you can disprove the existence of a god, or a superior intelligent life form. Creationism is always true!!
But so is the rest of religion. The Koran, the Bible, the whole schmeer. It is all totally, irrefutably true. That is why we do not call it "science", we call it religion. And creationism is also a part of religion. The defining trait of a scientific theory is that it HAS to be disprovable with physical evidence. This was defined by the philosopher Karl Popper in the 1930's (I think).
For example, the theory of relativity. If we saw something moving faster than the speed of light, if we were able to verify that speed, then the whole theory of relativity would come crashing down. It is disprovable, if you only have the evidence. So is evolution. If some super intelligent space aliens came and told us that they 'made' us, the life on earth and that they had manipulated all of our genes to make us evolve, then...if they gave us concrete evidence, there you go. Same thing with the theory of evolution. They are disprovable, this is known as falsifiability. That's why they are scientific theories. And of course, we have NOT found any evidence lke this. They adequately explain the phenomena of the natural world. That's why they became theories in the first place.
Any thoughts on that?