There have been many peer reviewed papers showing the complexity of having to evolve multiple mutations to account for the systems and features needed for living things.
That is the sharpshooter fallacy. It is easy to hit a bullseye at 2,000 yds when you can draw the bullseye around the bullet hole. In fact, you can do it every time.
What you are ignoring are all of the multi-residue adaptations that did not occur. It is like ignoring all of the losers in a lottery. If the odds of winning the lottery are 1 in 150 million, does that mean that there should only be a winner in 1 out of every 150 million lottery drawings? If so, how do you explain the fact that people win the lottery all of the time?
Its just reasonable deduction that a complex ability requires more than one or two or even many things working together to make it function. The things that have been used showing a certain stage of a more developed ability are complex themselves and require an explanation as to how they were able to mutate into existence.
If we lack an explanation, "God did it" is not the default fill in answer. That is a God of the Gaps fallacy.
We also have examples of irreducibly complex systems evolving in a step wise manner. One example is the mammalian middle ear. This structure requires three interacting tiny bones. Take away any one of those middle ear bones and that mammal will be deaf. This would mean that all three had to always be there, right?
WRONG!!!
Mammals evolved from reptiles. Reptiles have a single middle ear bone, and three lower jaw bones. Mammals have three middle ear bones, and one lower jaw bone. In the fossil record, we can find the intermediate steps in the mammal-like reptiles where two of the lower jaw bones are found at an intermediate step acting as both ear bones and jaw bones.
http://www.talkorigins.org/faqs/comdesc/section1.html#morphological_intermediates_ex2
We have the intermediate steps showing us how an irreducibly complex system did evolve. The sad part is that no matter how many IC systems we show did evolve, you will always search around and try to find one that we don't understand quite yet, and then claim once again that your God exists in our ignorance.
At what point do you understand what it means to have a positive argument for design? Why do you demand evidence for evolution when you require no evidence for your beliefs in a designer?