Sentence:  Many of us <WSD>brights</WSD> have devoted considerable time and energy at some point in our lives to looking at the arguments for and against the existence of God, and many <WSD>brights</WSD> continue to pursue these issues, hacking away vigorously at the arguments of believers as if they were trying to refute a rival scientific theory. 
Meaning of the word marked with <WSD> tags:  A person with a naturalistic worldview with no supernatural or mystical elements.