Correction,
I missed part of oneironauts quote:

If life did not come from non-life, then life has been around forever.

Your whole argument boils down to complexity. If something is sufficiently complex, then it must have been designed, and life fulfills that criterion. Well then, you have to apply that idea consistently. If life is too complex, then so is a life-designer, which must be way more complex than any organism or ecosystem we've ever seen. What are the chances of something THAT complicated just suddenly arising out of nothingness?