The generic noun form of bright is a tool to lay emphasis on the shared naturalistic worldview of a potentially large aggregate of persons. The term offers many individuals a means to step forward free of socially burdensome labels to speak more candidly and positively about their outlook.

Ugh. The idea of calling oneself a Bright just rubbed me the wrong way, and after reading this bit I figured out why. You want to talk about a "socially burdensome label", being a "bright" or "gifted" child, that most definitely qualifies. If I could find the slightest hint that these folks were attempting label reclaimation, it wouldn't bother me so much, but it just appears to me to be an attempt to assign a pretty name to secular, skeptial humanism.