Quote from MakeNoMistake:
We have here to highly unlikely scenarios:
1. life evolving from non life
2. man in the sky created life
And we have people supporting both sides saying "if it isn't one then it MUST be two!"
This is like saying "If you're wrong then I must be right!"
1. is possible but we have no proof... they could change
2. is at the moment based on faith... perhaps supported by our universe looking extremely fine tuned.
3. you left this one out... life got here from somewhere else and did not evolve from non life on earth.
by the way... here is a link to a szostak interview...
about 5 minutes into the video they discuss the murchison meteor and what they found out about amino acids.
you can see they take pan spermia serious as the talk about the murchison meteor... having amino acids and that it is possible that metor materials create the "left handedness" of our amino acids.
http://www.scientificamerican.com/article.cfm?id=the-handedness-of-life