I don't think Dawkins has ever said that science disproves the existence of God. He just sees no evidence for a god (or gods) and, in the absence of any such evidence, declines to believe in in/them.
People believing what they want to believe is fine (and I don't think Dawkins disagrees with this). It is when people want other people to believe what they believe, or at least obey the rules that they believe their god has set.
I have no problem with people who want to die for their beliefs - it is when they want others to die for their beliefs that it is a problem.
Or when a belief leads to things such as banning of contraception, even to the extent of disapproving of the use of condoms which can protect against HIV and other infections as well as preventing unwanted pregnancies. That's the problem with people believing in the great sky daddy (insert other deity of choice here).
He's now got himself a ireversible reputation. He can't backtrack.
So much so that he'll be first against the wall when Quetzalcoatl returns at the end of 2012 to claim back his planet.

Bye bye Mr Dawkins.