It does not even approach the question of how it began. Its the question of how the kidneys, gills and feathers "just happened" over time that I don't see in the record. Nor does an extrapolation of the record coupled with the current theory make clear to me how anything essential to the survival or function of the creature could have not have been with it from it's first moment of existance. I can imagine cells spontaneously deciding to band together and differentiate into a functioning whole, I just can't do it with a straight face.
Like I said, I'm not a Creationismalist, Evolution as an explanation of life on earth "sola scriptura" just does not seem to me to be as much rational science as a dogma seeking to find ways to trumpet the potential non-existence of God. I still vote for intelligent design and adaptive change over time.