Anyone who is not prone to biological imperative of 'belief' should perhaps look at this site:

The Brights

Apparently a Bright is:

A bright is a person who has a naturalistic worldview

A bright's worldview is free of
supernatural and mystical elements

The ethics and actions of a bright
are based on a naturalistic worldview.

Richard Dawkins says that the phrase was coined because 'atheist' was seen to be a 'down' word like 'homosexual'. Therefore 'Bright', like 'Gay'.