[2] Singapore's non-religious tend to be atheists, agnostics, humanists, theists, deists or skeptics.
Some locals affiliate with no religion, but will still continue practice traditional rituals like ancestral worship, which they do not necessarily regard as religious in essence.
[3] Since 2005, informal atheist groups had organised social gatherings to discuss religion and secularism, and popular books on the topic from authors such as Richard Dawkins and Christopher Hitchens.
[4] In 2008, the Singapore Humanism Meetup was formed as a social network of secular humanists, atheists and agnostics.
Many pioneer members of the society met at gatherings organised by the Singapore Humanism Meetup.