[Jack]

The watchmaker analogy has been refuted many times. I would recommend a read of the full article from which this conclusion is taken:

The watchmaker argument is not a proof, it is an analogy. As most other analogies it is quite lame. It is contradictive, misses many important features, does not aid us in knowing who the watchmaker is, and most important does not stand alone as evidence of god, but must reliy on external evidence. Therefore the argument does not the least prove that the world was designed by a superhuman being. I cannot help ending with these rude, yet beautiful and poetic, words, which sum up P.W. Atkins wonderful book The Second Law (Atkins, 1994) "We began with the steam engine... Nature reflects the steam engine, but in a much more elaborate way... We are the children of chaos, and the deep structure of change is decay. At root there is only corruption, and the unstemmable tide of chaos. Gone is purpose; all there is left is direction. This is the bleakness we have to accept as we peer deeply and dispassionately into the heart of the Universe. Yet when we look around and see beauty, when we look within and experience conciousness, and when we participate in the delights of life, we know in our hearts that the heart of the Universe is richer by far. But that is sentiment, and is not what we should know in our minds. Science and the steam engine have a greater nobility. Together they reveal the awesome grandeur of the simplicity of complexity."

Apologia Atheos: The Watchmaker argument refuted

There is no reason to suppose that the complexity of the universe demands a supernatural cause.