I am not sure I would agree with his assertion at all. If I understand his point of view correctly, he says, in essence, that we should take God and the Supernatural out of religion. No such thing, but we can learn from the ritual and sense of community that the church promotes, or has.
Well, I would disagree with that in its entirety. If you remove the supernatural, remove God, from religion, you are left with a bunch of bearded old men meddling in everyone elses lives, telling them how to live, except without the authority of the ultimate being they say they have.
What can secular society learn from religion? What do you think, specifically, Khandro, that secular society could use to improve society? I mean, this whole concept that somehow the church and religion and the religious have some sort of level of connection, of understanding, of experience of the cosmos that secularists don't is a hypothesis totally lacking in any quantitative assessment.
You will see secular communal events all the time, from book clubs to business breakfast meetings, to village fetes, to golden jubilee flag waving days - all these foster a sense of community, and all available without having some priest spouting in your ear about original sin, or a stream of sanctimonious platitudes.
And where secular society does wish to adopt a religious ritual, in an effort to remove division and reduce phobias, The church rejects gay marriage out of hand - but fail miserably to make any sort of rational case for doing so.
Mr de Botton sounds to me like a kind of "cant we all get along" accomodationist, rather like Chris Mooney in the US. There is little positive that religion can give to secular society, and little to be gained from accomodating bizarre beliefs, particularly if they impact upon lifestyles of others in society....