Fancy meeting you here. Well, now that you have graced us with a visit, as a well known illustrious evolution and science loving predecessor was want to do, here's something to wrap your "scientific" mind around:
You say that there is no reason life had to have a supernatural beginning, but in doing so you trip on the obvious paradox that strict evolutionists try so desperately to explain away. Which is that they generally agree that the universe, and biological life that sprang had a beginning - a moment in time before which there was no universe and after which there was. By definition, anything that has a beginning is a creation.
That is the crux, isn't it? Any beginning is by definition a moment of creation, and once that is accepted, as it must be, you are faced with the inescapable fact that every creation hada source of creation - something that both preceded and superceded the creation. Thus our natural universe and the resultant life were created by something that superceded and was superior to them. In other words, a creator which was, once again by definition, supernatural.
Call it what you want and try to explain it away all you want, but at the end of the day it is inescapable that life was created by something supernatural.
Many who try to explain away the obvious creation of the universe as something random or something that they are somehow superior enough to explain likely do so because they cannot accept the idea that anything could possibly be beyond their knowledge or (gasp) superior to them. Yet by comparison, humans and their woefully limited science are insignificant compared to the creation and their attempts to explain it away in order to deny how vastly greater it is to them is the ultimate delusion.
Such delusions has always been the downfall of those whose religion is the false science of the day. By limiting themselves to the restraints of their false self-created paradigm that only accepts what their limited science tells them is verifiable and true, they become less than those they pretend to be superior too. Whereas the worshippers of science have their realities and possibilities limited by the bounds of the science they worship, those who accept creation and do not accept science as the supreme authority have a reality and a universe that may be infinite by comparison.