'The Sunday Assembly'
Please remember two things.
The first is that it's not charitable to mock other people's beliefs.
The second is that these 'overwhelmingly young, white and middle class' people are cleverer than you and me, if only because they'd be the first to say so.They are absolutely sure that God does not exist, and are all probably deeply familiar with the Flying Spaghetti Fairy Sky Dawkins and all her works.
Working on the established principle that superstition is the bedfellow of scepticism, you could probably pay off your mortgage in one go by offering to read these characters' tea leaves for them at a fiver a pop.