I'm not sure why de Botton is saying that he is looking for an antidote to "aggressive" and "destructive" atheists like Dawkins. I suspect he has never read, listened to or engaged with anything he has said on the subject. He should try reading Dawkins' "Unweaving the Rainbow", which would surely clear up any illusions he may have about this being a destructive philosophy.
And I completely disagree with building anything in the vein of a temple to atheism - this would definitely be a gift to religionists who like to counterclaim, falsely, that atheism is just another form of religion.
Science is like a blabbermouth who ruins the movie by telling you how it ends. Well, I say there are some things we don't want to know. Important things. - Ned Flanders