What's your phantasmagorical belief system?

Alain de Botton, pop philosopher and atheist, has written a book on Religion for Atheists (see that link for a list of what he thinks religion has to offer the world), which could be curious reading. He recently tweeted this:

Atheists have belief systems just as phantasmagorical as the religious to keep them assured of their significance.

It's good of him to say so.