Explaining the fact that we exist

[robvalue]

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This is a question that I wrestled with superficially when I first became an atheist. I was content with my answer to this question for a while, but after a recent discussion with a Christian friend of mine, the entire topic just became confusing to me. And, like I said in my introduction (http://atheistforums.org/thread-45867.html), I need some help when walking through difficult questions.

The question is this: "There were many transitional points in our universe's history that led to us existing. If one of them failed to produce the results that it did, we wouldn't be here, existing. Isn't it too much of a coincidence? Each transition point was against huge odds, and each of them was an extraordinary coincidence. How is it possible that we are existing against such overwhelming odds?"

I had a basic response to this like, "just because it's extremely unlikely, doesn't mean it can't happen", but I am not satisfied with the answer. Can anybody lead me through the basic thought process behind why we can exist against such overwhelming odds? I have my own thoughts, but I am willing, and needing to restart my thought process. 

Thanks!

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First and fore most the existence of human beings explains that there is a God who created all, how can atoms, protons and neutrons create a human being there is no way? Not too mention the inside organs, for our organs  to be so detailed in position, how can it be possible that we come from no where? Not to mention the fact that there is life inside of pregnant women, if we all came from no where how is it that we're able to multiple in vast numbers? By sperm and  an egg correct? Well how could a sperm and an egg produce an unborn child if there was not a source behind it? The ocean is so vast with water and the sky is a reflection of the waters!!!

It's really complicated, you don't understand it, therefor it was a zombie Jew on stick? This is called the argument from incredulity. You can't imagine any other way except your own magic story. Any other magic story works just as well, as does "it just happened, deal with it" or perhaps the amazing "let's learn more about it".