What's Dawkins afraid of. . .my guess:  a face-to-face beating by a professional philosopher who has demonstrated again and again that Dawkins knows diddly about Christian theology, logic, or common courtesy. 
From the article:
Something is afoot in Oxford. The Christians are fighting back. To herald the '
Reasonable Faith Tour' with William Lane Craig, Oxford's buses are carrying the slogan: 
There's Probably No Dawkins. Now Stop Worrying and Enjoy Oct 25th at the Sheldonian Theatre.
The advertising campaign follows Richard Dawkins' 
refusal to debate the  existence of God with philosopher William Lane Craig as he visits the  UK this month. He has an open invitation to debate Professor Craig at  Oxford's Sheldonian Theatre on 25th October. The Oxford bus campaign  echoes the 2009 London atheist bus advertisements: 'There's Probably No  God. Now Stop Worrying And Enjoy Your Life.'  
[. . .]
Dr Dawkins preaches the need to seek truth, question everything, and to  not become duped by emotions or wishful thinking... yet he has used his  website (the "clear-thinking oasis") to hurl ad hominem attacks  at 'Dr' Craig (as he calls him, on the rare occasion that he  acknowledges his title), complaining that his ideas are 'unpleasant'.  This was the precise strategy he used against His Grace a few years ago,  labelling His Grace 'nasty' (quoted in the 'honours and citations').  Academic responses and counter-arguments? Zero.
Dr Dawkins' hypocrisy is pure and undiluted.
Read the whole thing. 
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