For many of us choosing what to believe is no big deal - no one is forcing dogma on us, we can follow our conscience in a free society. But many others are not so lucky. Losing the faith of their family or community can be painful and disorientating. Leaving their religion can mean not just leaving behind god, but family, friends and their community. They might even face retribution.
A former muslim and Afghan citizen has recently been granted asylum in the UK for religious reasons - because he is an atheist. Find out more at the BBC ,The Muslim Times or read the New Humanist article.