How did life begin?

[Willd]

Before I start the main part of this post I'd just like to say a little something about where I'm coming from. I have been lurking this forum for a little while now and have made a couple of posts but this is my first post of any significant content.

I am a Christian and am currently an engineering student in Sheffield, England. I would like to think that in general I'm a logical person and up to now I have had no major problems with accepting Christianity as logical. There are certain aspects that I'm unsure of but there have been other things I have experienced/seen happen that have made it seem illogical not to believe.

Anyway, enough about me and onto what I wanted to post about. I'm obviously familiar with the theory of evolution and how it postures that life evolved from single celled organisms and eventually led to what we have now (this is an area I am actually slightly unsure of what I think/believe but for now I'd rather it wasn't too involved in this thread). What I don't know so much about is an atheist viewpoint on how the very first life form was created.

From what I have read (admittedly a lot of biased material, but all with seemingly strong references) it seems that the chance of life occuring spontaneously is all but zero. There is the overused analogy of it being as likely as a tornado blowing through a junkyard and assembling a boeing 747 but from what I know that doesn't seem absurd. Life is immensely complex, far more so than a 747, requiring as many as 200 proteins each made up of a string of 100+ amino acids for even the simplest form of life.

What then is the atheist explanation for life on Earth? The only theory I've ever heard is panspermia which frankly seems slightly off the wall and in any case just shifts the problem to somewhere else in the universe. If you could give me any further insight as to current theories and any evidence for them that would be greatly appreciated.