I would ask you: what caused matter to arise from nothing? How did something come from nothing-nothing, as in no forces, no matter, no energy, just nothing. 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?). Presumably, science should look for the best possible answer in such a scenrio, correct? Why then should science not at least allow for the existence of an Intelligent Creator beyond the natural sphere? There wer scientists in years past (still are some around) that did not believe in Darwin's Theory, and incredibly, they made important discoveries quite well.
A simple quantum event. Next?
Because it no more contributes to understanding what really happened than to say "the magical dog did it."
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)