The Atheist's Guide to Christmas is a funny, thoughtful handbook all about enjoying Christmas, from 42 of the world's most entertaining atheists. It features everything from an atheist Christmas miracle to a guide to the best Christmas pop hits, and contributors include Richard Dawkins, Charlie Brooker, Ben Goldacre, Jenny Colgan, David Baddiel, Simon Singh, AC Grayling, Brian Cox and Richard Herring.

The great news is that 50% of the profits made from the sale of this book will come to THT!

Last year, Guardian journalist Ariane Sherine launched the Atheist Bus Campaign, which featured the advert 'There's probably no God. Now stop worrying and enjoy your life' on 800 UK buses in January 2009. Now Ariane and dozens of other atheist writers, comedians and scientists are joining together to raise money for THT.

You can purchase a copy on Amazon here or head down to your local bookshop.