Read other letters about this article
You wrote:
"If you read carefully into what he is saying, the question 'why are we here?' begs the question. In order to ask that question, you must first assume that humans have been granted a purpose by some intelligent being outside of themselves."
Um... no you don't. Plenty of philosophers have considered that very question in the complete absence of factoring in any deity. So your statement is false, and therefore so is your defense of Dawkins.