What about rocks? sand? mountains? oceans? planets? stars? galaxies? these are all highly complex systems. Science seems to indicate that all these complex systems are the result of interactions between a number of very simple and elementary processes. If they could have 'spontaneously' emerged, why couldn't life? What makes life so different?
Basically, if your reasoning is that God created life because it could not have emerged on its own, then you have to believe that God created everything in the universe, because you are denying the possibility that a simple set of rules working together can result in complex behavior.
A much better argument is about who/what set those rules in place. That is the most fundamental issue in understanding nature. Life is not a separate issue that can be thought of on a different level.
Dreams of a dreamer from afar to a fardreamer.