Francis Collins & Kenneth Miller are christians who favour  theistic evolution.
             " Why evolution is true " is a superb overview on the subject,  by Jerry A. Coyne .
 Also Richard Dawkins deals with the Paley's watch argument in " The Blind watch maker "
  Robert M. Price & Ed Suominen show the spectrum of views to evolution in , " Evolving out of Eden, christian responses to evolution "

I think it is more likely that life on earth formed by a billion little steps up a stairway than one giant leap up a cliff of instantaneous creation.  The question is could it have happened just by natural selection or did it need some tinkering ? It does seem nearly incredible that it could have done so unaided, but then there is no other theory and anyway how would a God evolve ?

If you find a watch lying out in the heath you would think that it had formed not instantaneously by magic but by a manufacturing process. In fact you might guess that there had been more primitive designs of watch before hand. The designs could be said to have undergone a sort of evolution where the organism doing the natural selection was humans. Also the components had developed in quite separate spheres and were adapted to exist in a sort of symbiosis with each other.
    Interesting to  read about possible pathway of evolution of
chloroplasts on wikipedia.
Chloroplasts are considered to have originated from cyanobacteria through endosymbiosis—when a eukaryotic cell engulfed a photosynthesizing cyanobacterium which remained and became a permanent resident in the cell.